We proposed a new saccharides sensor developed by symmetrical optical waveguide(SOW)-based surface plasmon resonance(SPR).This unique MgF_(2)/Au/MgF_(2)/Analyte film structure results in longer suface plasmon wave(SPW...We proposed a new saccharides sensor developed by symmetrical optical waveguide(SOW)-based surface plasmon resonance(SPR).This unique MgF_(2)/Au/MgF_(2)/Analyte film structure results in longer suface plasmon wave(SPW)propagation lengths and depths,leading to an increment of resolution.In this paper,we managed to decorate the dielectric interface(MgF_(2) layer)by depositing a thin polydopamine film as surface adherent that provides a platform for secondary reactions with the probe molecule.3-Aminophenylboronic acid(3-PBA)is chosen to be the saccharides sense probe molecule in the present work.The aqueous huumnor of Diabetes and Cataract patient whose blood glucose level is normal are analyzed and the results dermonstrated that this sensor shows great potential in monitoring the blood siugar and can be adapted in the field of biological monitoring in the future.展开更多
The water quality testing principle by surface plasmon resonance(SPR)is introduced.Using the scanning mode angular spectral testing and the CCD angular spectral testing,a kind of highresolution,wide-range,and portable...The water quality testing principle by surface plasmon resonance(SPR)is introduced.Using the scanning mode angular spectral testing and the CCD angular spectral testing,a kind of highresolution,wide-range,and portable optical waveguide SPR angular spectral testing system is studied,the method of improving the testing accuracy is discussed,and a long-life surface plasmon optical waveguide transducer is also proposed.Utilizing the SPR testing system,we contrastively tack some test for several sorts of solution,the results presented that significant differences of SPR peaks observed in different sorts of liquid,which indicated the effectiveness of SPR technology used in water quality testing and analysis.展开更多
A plasmonics waveguide structure that consist of a non-through metal–insulator–metal(MIM)waveguide coupled with a D-shaped cavity was designed.And the transmission properties,magnetic field distribution,and refracti...A plasmonics waveguide structure that consist of a non-through metal–insulator–metal(MIM)waveguide coupled with a D-shaped cavity was designed.And the transmission properties,magnetic field distribution,and refractive index sensing functionality were simulated using the finite element method(FEM).A multi-Fano resonance phenomenon was clearly observable in the transmission spectra.The Fano resonances observed in the proposed structure arise from the interaction between the discrete states of the Dshaped resonant cavity and the continuum state of the non-through MIM waveguide.The influence of structural parameters on Fano resonance modulation was investigated through systematic parameter adjustments.Additionally,the refractive index sensing properties,based on the Fano resonance,were investigated by varying the refractive index of the MIM waveguide's insulator layer.A maximum sensitivity and FOM of 1155 RIU/nm and 40 were achieved,respectively.This research opens up new possibilities for designing and exploring high-sensitivity photonic devices,micro-sensors,and innovative on-chip sensing architectures for future applications.展开更多
A single baffle metal–insulator–metal(MIM)waveguide coupled with a semi-circular cavity and a cross-shaped cavity is proposed based on the multiple Fano resonance characteristics of surface plasmon polaritons(SPPs)s...A single baffle metal–insulator–metal(MIM)waveguide coupled with a semi-circular cavity and a cross-shaped cavity is proposed based on the multiple Fano resonance characteristics of surface plasmon polaritons(SPPs)subwavelength structure.The isolated state formed by two resonators interferes with the wider continuous state mode formed by the metal baffle,forming Fano resonance that can independently be tuned into five different modes.The formation mechanism of Fano resonance is analyzed based on the multimode interference coupled mode theory(MICMT).The finite element method(FEM)and MICMT are used to simulate the transmission spectra of this structure and analyze the influence of structural parameters on the refractive index sensing characteristics.And the transmission responses calculated by the FEM simulation are consistent with the MICMT theoretical results very well.The results show that the figure of merit(FOM)can reach 193 and the ultra-high sensitivity is 1600 nm/RIU after the structure parameters have been optimized,and can provide theoretical basis for designing the high sensitive refractive index sensors based on SPPs waveguide for high-density photonic integration with excellent performance in the near future.展开更多
We propose and analyze a long-range dielectric-loaded surface plasmon polariton （SPP） waveguide based on graded-index ridge over server millimeter distances. Then the influence of the dielectric thickness and the ri...We propose and analyze a long-range dielectric-loaded surface plasmon polariton （SPP） waveguide based on graded-index ridge over server millimeter distances. Then the influence of the dielectric thickness and the ridge refractive index on propagation length and mode width is discussed and simulated with the finite ele- ment raethod. The result shows that the SPP can propagate as long as 3.42 mm, as well as the mode width keeping as 1.64μm, a better one compared with the fixed refractive index. Considering its nanoscale dimension and outstanding performance, the structure is easily realized when connected with electrodes.展开更多
A refractive index sensor based on Fano resonances in metal-insulator-metal （MIM） waveguides coupled with rectangular and dual side rings resonators is proposed. The sensing properties are numerically simulated by t...A refractive index sensor based on Fano resonances in metal-insulator-metal （MIM） waveguides coupled with rectangular and dual side rings resonators is proposed. The sensing properties are numerically simulated by the finite element method （FEM）. For the interaction of the narrow-band spectral response and the broadband spectral response caused by the side-coupled resonators and the rectangular resonator, respectively, the transmission spectra exhibit a sharp and asymmetric profile. Results are analyzed using the coupled-mode theory based on the transmission line theory. The coupled mode theory is employed to explain the Fano resonance effect. The results show that with an increase in the refractive index of the fill dielectric material in the slot of the system, the Fano resonance peak exhibits a remarkable red shift. Through the optimization of structural parameters, we achieve a theoretical value of the refractive index sensitivity （S） as high as 1160 nm/RIU, and the corresponding sensing resolution is 8.62 × 10 -5 RIU. In addition, the coupled MIM waveguide structure can be easily extended to other similar compact structures to realize the sensing task and integrated with other photonic devices at the chip scale. This work paves the way toward the sensitive nanometer scale refractive index sensor for design and application.展开更多
Nowdays, the study of measurement of the biological field focuses on the research of improving surface plasmon resonance （SPR） in the fields of integration and detection sensitivity. We designed a kind of grating co...Nowdays, the study of measurement of the biological field focuses on the research of improving surface plasmon resonance （SPR） in the fields of integration and detection sensitivity. We designed a kind of grating connected surface plasmon resonance sensor. Theoretically, we analyzed the wave vector and the. effective refractive index relations with the diffraction grating structure. Then we obtained the nanoparticles enhancement SPR structure with a resolution 10times higher than that of traditional SPR sensors. Also, we used the finite-difference time-domain （FDTD） analysis and simulation which showed that it was obvious with coupling effect by the nanoparticles enhancement SPR structure that the reflectance spectral bandwidth results validated the structure significantly which improved the sensitivity. Experimental results showed that the dynamic response of the designed sensor reached 10^-6 RIU （refractive index unit）. This study has the certain significance to long-distance and special sensing applications.展开更多
Based on the finite difference time domain method, we investigated theoretically the optical properties and the plasmonic interactions between a gold film perforated with periodic sub-wavelength holes and a thin gold ...Based on the finite difference time domain method, we investigated theoretically the optical properties and the plasmonic interactions between a gold film perforated with periodic sub-wavelength holes and a thin gold film. We showed that the plasmon resonant energies and intensities depend strongly on the thicknesses of the two films and the lattice constant. Based on the distributions of normal electric field component Ez, tangential electric field component Ey and total energy, we showed that the optical transmission is due to the collaboration of the localized waveguide resonance, the surface plasmon resonance and the coupling of the fiat-surface plasmon of the two layers.展开更多
Triangular Au-Ag framework nanostructures （TFN） were synthesized via a multi-step galvanic replacement reaction （MGRR） of single-crystalline triangular silver nanoplates in a chlorauric acid （HAuCl4） solution at...Triangular Au-Ag framework nanostructures （TFN） were synthesized via a multi-step galvanic replacement reaction （MGRR） of single-crystalline triangular silver nanoplates in a chlorauric acid （HAuCl4） solution at room temperature. The morphological, compositional, and crystal structural changes involved with reaction steps were analyzed by using transmission electron microscopy（TEM）, energy-dispersive X-ray spectrometry （EDX）, and X-ray diffraction. TEM combined with EDX and selected area electron diffraction confirmed the replacement of Ag with Au. The in-plane dipolar surface plasmon resonance （SPR） absorption band of the Ag nanoplates locating initially at around 700 nm gradually redshifted to 1 100 nm via a multi-stage replacement manner after 7 stages. The adding amount of HAuCl4 per stage influenced the average redshift value per stage, thus enabled a fine tuning of the in-plane dipolar band. A proposed formation mechanism of the original Ag nanoplates developing pores while growing Au nanoparticles covering this underlying structure at more reaction steps was confirmed by exploiting surface-enhanced Raman scattering （SERS）.展开更多
Copper(Cu)nanoparticles(NPs)are synthesized under the near-surface region of the Nd∶Y_(3)Al_(5)O_(12)(Nd:YAG)crystal by direct Cu^(+)ions implantation.Subsequently,the monolithic ridge waveguide with embedded Cu NPs ...Copper(Cu)nanoparticles(NPs)are synthesized under the near-surface region of the Nd∶Y_(3)Al_(5)O_(12)(Nd:YAG)crystal by direct Cu^(+)ions implantation.Subsequently,the monolithic ridge waveguide with embedded Cu NPs is fabricated by C^(4+)ions irradiation and diamond saw dicing.The nonlinear optical response of the sample is investigated by the Z-scan technique,and pronounced saturable absorption is observed at the 1030 nm femtosecond laser.Based on the obvious saturable absorption of Cu NPs embedded Nd:YAG crystal,1μm monolithic mode-locked pulsed waveguide laser is implemented by evanescent field interaction between NPs and waveguide modes,reaching the pulse duration of 24.8 ps and repetition rate of 7.8 GHz.The work combines waveguides with NPs,achieving pulsed laser devices based on monolithic waveguide chips.展开更多
A surface plasmon resonance(SPR)sensor with Ag/PbS/GR hybrid nanostructure has been proposed for the diagnostics of liquid phase samples.Here Ag/PbS/GR hybrid nanostructure is designed as an asymmetric MIM waveguide f...A surface plasmon resonance(SPR)sensor with Ag/PbS/GR hybrid nanostructure has been proposed for the diagnostics of liquid phase samples.Here Ag/PbS/GR hybrid nanostructure is designed as an asymmetric MIM waveguide for surface plasmon.Due to the guided wave SPR(GWSPR)modes,the index of the liquid phase samples can be measured more accurately than the conventional SPR sensors.Numerical simulation results show that the sensitivity of the sensor is about 5 times higher than the conventional SPR sensors.The origin of the enhancement mechanism is the combination of GWSPR in the Ag/PbS/GR hybrid nanostructure which enables the surface plasmon to spread along the PbS layer.In Ag/PbS/GR hybrid nanostructure,the electric field is concentrated mostly in the PbS layer,and the enhancement of the field intensity is nearly30%.展开更多
传统的物质浓度的检测方法主要是基于吸收光度法,其中包括分光光度计、气相或液相色谱法等,虽然这几种方法的测量灵敏度较高,但是由于其测试的过程较复杂,测试设备体积过大且耗时较长。因此研究一种测量溶液折射率微小变化的便捷方法。...传统的物质浓度的检测方法主要是基于吸收光度法,其中包括分光光度计、气相或液相色谱法等,虽然这几种方法的测量灵敏度较高,但是由于其测试的过程较复杂,测试设备体积过大且耗时较长。因此研究一种测量溶液折射率微小变化的便捷方法。主要利用双面金属包覆波导的高阶模特性,从而实现了测量的高灵敏度。通过使用一种双金属包层波导结构,以待测样品作为其导波层,两层金属薄膜作为其包层。醋酸溶液和溴甲酚绿在波导引导层中消光系数的微小变化会导致反射光谱中光强度的显著变化。利用双面金属包覆波导的衰减全反射(attenuated total reflection)曲线对波导结构的灵敏响应从而实现了物质的痕量检测。理论模拟和实验结果均表明,该方法对乙酸的检测限可低至1.3 nm,与表面等离子体场增强共振散射(SP-RLS)方法相比,其性能提高了16倍,与火焰原子吸收光谱法和荧光光谱法相比,分别提高了4倍。该方法是一种耗时短、需样少、稳定性高、便捷且廉价的一种溶液浓度实时检测技术,为以后的化工生产流程提供了一种有效的检测路线。展开更多
基金support from NSFC China (grants 61275188,61378089 and 81171375)the key project of Guangdong province (2012A080203008)+1 种基金the Basic Research Program of Shenzhen City (JC201105201121A)State Key Laboratory Open Foundation Issue,China (grant 12K05ESPCT).
文摘We proposed a new saccharides sensor developed by symmetrical optical waveguide(SOW)-based surface plasmon resonance(SPR).This unique MgF_(2)/Au/MgF_(2)/Analyte film structure results in longer suface plasmon wave(SPW)propagation lengths and depths,leading to an increment of resolution.In this paper,we managed to decorate the dielectric interface(MgF_(2) layer)by depositing a thin polydopamine film as surface adherent that provides a platform for secondary reactions with the probe molecule.3-Aminophenylboronic acid(3-PBA)is chosen to be the saccharides sense probe molecule in the present work.The aqueous huumnor of Diabetes and Cataract patient whose blood glucose level is normal are analyzed and the results dermonstrated that this sensor shows great potential in monitoring the blood siugar and can be adapted in the field of biological monitoring in the future.
文摘The water quality testing principle by surface plasmon resonance(SPR)is introduced.Using the scanning mode angular spectral testing and the CCD angular spectral testing,a kind of highresolution,wide-range,and portable optical waveguide SPR angular spectral testing system is studied,the method of improving the testing accuracy is discussed,and a long-life surface plasmon optical waveguide transducer is also proposed.Utilizing the SPR testing system,we contrastively tack some test for several sorts of solution,the results presented that significant differences of SPR peaks observed in different sorts of liquid,which indicated the effectiveness of SPR technology used in water quality testing and analysis.
文摘A plasmonics waveguide structure that consist of a non-through metal–insulator–metal(MIM)waveguide coupled with a D-shaped cavity was designed.And the transmission properties,magnetic field distribution,and refractive index sensing functionality were simulated using the finite element method(FEM).A multi-Fano resonance phenomenon was clearly observable in the transmission spectra.The Fano resonances observed in the proposed structure arise from the interaction between the discrete states of the Dshaped resonant cavity and the continuum state of the non-through MIM waveguide.The influence of structural parameters on Fano resonance modulation was investigated through systematic parameter adjustments.Additionally,the refractive index sensing properties,based on the Fano resonance,were investigated by varying the refractive index of the MIM waveguide's insulator layer.A maximum sensitivity and FOM of 1155 RIU/nm and 40 were achieved,respectively.This research opens up new possibilities for designing and exploring high-sensitivity photonic devices,micro-sensors,and innovative on-chip sensing architectures for future applications.
基金National Natural Science Foundation of China(Grant Nos.61367005 and 61865008)the Natural Science Foundation of Gansu Province,China(Grant No.17JR5RA078).
文摘A single baffle metal–insulator–metal(MIM)waveguide coupled with a semi-circular cavity and a cross-shaped cavity is proposed based on the multiple Fano resonance characteristics of surface plasmon polaritons(SPPs)subwavelength structure.The isolated state formed by two resonators interferes with the wider continuous state mode formed by the metal baffle,forming Fano resonance that can independently be tuned into five different modes.The formation mechanism of Fano resonance is analyzed based on the multimode interference coupled mode theory(MICMT).The finite element method(FEM)and MICMT are used to simulate the transmission spectra of this structure and analyze the influence of structural parameters on the refractive index sensing characteristics.And the transmission responses calculated by the FEM simulation are consistent with the MICMT theoretical results very well.The results show that the figure of merit(FOM)can reach 193 and the ultra-high sensitivity is 1600 nm/RIU after the structure parameters have been optimized,and can provide theoretical basis for designing the high sensitive refractive index sensors based on SPPs waveguide for high-density photonic integration with excellent performance in the near future.
基金supported by the National Natural Science Foundation of China(Nos.61275201 and 61372037)the Beijing Excellent Ph.D.Thesis Guidance Foundation(No.20131001301)+1 种基金the Fund of State Key Laboratory of Information Photonics and Optical Communications(Beijing University of Posts and Telecommunications)the Opened Fund of the State Key Laboratory on Integrated Optoelectronics,Institute of Semiconductors,Chinese Academy of Sciences
文摘We propose and analyze a long-range dielectric-loaded surface plasmon polariton （SPP） waveguide based on graded-index ridge over server millimeter distances. Then the influence of the dielectric thickness and the ridge refractive index on propagation length and mode width is discussed and simulated with the finite ele- ment raethod. The result shows that the SPP can propagate as long as 3.42 mm, as well as the mode width keeping as 1.64μm, a better one compared with the fixed refractive index. Considering its nanoscale dimension and outstanding performance, the structure is easily realized when connected with electrodes.
基金The authors thank Xiangxian WANG from the School of Science, Lanzhou University of Technology, Lanzhou, China for their discussions to this research. This work is supported by the National Natural Science Foundation of China （Grant Nos. 61367005 and 74011119） and the Natural Science Foundation of Gansu Province （Grant No. 17JR5RA078）.
文摘A refractive index sensor based on Fano resonances in metal-insulator-metal （MIM） waveguides coupled with rectangular and dual side rings resonators is proposed. The sensing properties are numerically simulated by the finite element method （FEM）. For the interaction of the narrow-band spectral response and the broadband spectral response caused by the side-coupled resonators and the rectangular resonator, respectively, the transmission spectra exhibit a sharp and asymmetric profile. Results are analyzed using the coupled-mode theory based on the transmission line theory. The coupled mode theory is employed to explain the Fano resonance effect. The results show that with an increase in the refractive index of the fill dielectric material in the slot of the system, the Fano resonance peak exhibits a remarkable red shift. Through the optimization of structural parameters, we achieve a theoretical value of the refractive index sensitivity （S） as high as 1160 nm/RIU, and the corresponding sensing resolution is 8.62 × 10 -5 RIU. In addition, the coupled MIM waveguide structure can be easily extended to other similar compact structures to realize the sensing task and integrated with other photonic devices at the chip scale. This work paves the way toward the sensitive nanometer scale refractive index sensor for design and application.
基金This work was supported by the National Natural Science Foundation of China （No. 61061006） and Guangxi Normal University Doctor Scientific Research Foundation.
文摘Nowdays, the study of measurement of the biological field focuses on the research of improving surface plasmon resonance （SPR） in the fields of integration and detection sensitivity. We designed a kind of grating connected surface plasmon resonance sensor. Theoretically, we analyzed the wave vector and the. effective refractive index relations with the diffraction grating structure. Then we obtained the nanoparticles enhancement SPR structure with a resolution 10times higher than that of traditional SPR sensors. Also, we used the finite-difference time-domain （FDTD） analysis and simulation which showed that it was obvious with coupling effect by the nanoparticles enhancement SPR structure that the reflectance spectral bandwidth results validated the structure significantly which improved the sensitivity. Experimental results showed that the dynamic response of the designed sensor reached 10^-6 RIU （refractive index unit）. This study has the certain significance to long-distance and special sensing applications.
基金Project supported by the National Natural Science Foundation of China(Grant No.60708014)the Science Foundation for Postdoctorate of China(Grant No.2004035083)+2 种基金the Natural Science Foundation of Hunan Province of China(Grant No.06JJ2034)the Excellent Doctorate Dissertation Foundation of Central South University(Grant No.2008yb039)the Hunan Provincial Innovation Foundation for Postgraduate(Grant No.CX2009B029)
文摘Based on the finite difference time domain method, we investigated theoretically the optical properties and the plasmonic interactions between a gold film perforated with periodic sub-wavelength holes and a thin gold film. We showed that the plasmon resonant energies and intensities depend strongly on the thicknesses of the two films and the lattice constant. Based on the distributions of normal electric field component Ez, tangential electric field component Ey and total energy, we showed that the optical transmission is due to the collaboration of the localized waveguide resonance, the surface plasmon resonance and the coupling of the fiat-surface plasmon of the two layers.
基金Project(10804101)supported by the National Natural Science Foundation of ChinaProject(2007CB815102)supported by the National Basic Research Program of ChinaProject(2007B08007)supported by the Science and Technology Development Foundation of Chinese Academy of Engineering Physics,China
文摘Triangular Au-Ag framework nanostructures （TFN） were synthesized via a multi-step galvanic replacement reaction （MGRR） of single-crystalline triangular silver nanoplates in a chlorauric acid （HAuCl4） solution at room temperature. The morphological, compositional, and crystal structural changes involved with reaction steps were analyzed by using transmission electron microscopy（TEM）, energy-dispersive X-ray spectrometry （EDX）, and X-ray diffraction. TEM combined with EDX and selected area electron diffraction confirmed the replacement of Ag with Au. The in-plane dipolar surface plasmon resonance （SPR） absorption band of the Ag nanoplates locating initially at around 700 nm gradually redshifted to 1 100 nm via a multi-stage replacement manner after 7 stages. The adding amount of HAuCl4 per stage influenced the average redshift value per stage, thus enabled a fine tuning of the in-plane dipolar band. A proposed formation mechanism of the original Ag nanoplates developing pores while growing Au nanoparticles covering this underlying structure at more reaction steps was confirmed by exploiting surface-enhanced Raman scattering （SERS）.
基金supported by the National Natural Science Foundation of China(NSFC)(Nos.11535008 and 61975221)the Major Program of Natural Science Foundation of Shandong Province(No.ZR2018ZB0649)。
文摘Copper(Cu)nanoparticles(NPs)are synthesized under the near-surface region of the Nd∶Y_(3)Al_(5)O_(12)(Nd:YAG)crystal by direct Cu^(+)ions implantation.Subsequently,the monolithic ridge waveguide with embedded Cu NPs is fabricated by C^(4+)ions irradiation and diamond saw dicing.The nonlinear optical response of the sample is investigated by the Z-scan technique,and pronounced saturable absorption is observed at the 1030 nm femtosecond laser.Based on the obvious saturable absorption of Cu NPs embedded Nd:YAG crystal,1μm monolithic mode-locked pulsed waveguide laser is implemented by evanescent field interaction between NPs and waveguide modes,reaching the pulse duration of 24.8 ps and repetition rate of 7.8 GHz.The work combines waveguides with NPs,achieving pulsed laser devices based on monolithic waveguide chips.
基金supported by Anhui University Natural Science Research Project,China(KJ2015A153)National Natural Science Foundation of China (11304002)
文摘A surface plasmon resonance(SPR)sensor with Ag/PbS/GR hybrid nanostructure has been proposed for the diagnostics of liquid phase samples.Here Ag/PbS/GR hybrid nanostructure is designed as an asymmetric MIM waveguide for surface plasmon.Due to the guided wave SPR(GWSPR)modes,the index of the liquid phase samples can be measured more accurately than the conventional SPR sensors.Numerical simulation results show that the sensitivity of the sensor is about 5 times higher than the conventional SPR sensors.The origin of the enhancement mechanism is the combination of GWSPR in the Ag/PbS/GR hybrid nanostructure which enables the surface plasmon to spread along the PbS layer.In Ag/PbS/GR hybrid nanostructure,the electric field is concentrated mostly in the PbS layer,and the enhancement of the field intensity is nearly30%.
文摘传统的物质浓度的检测方法主要是基于吸收光度法,其中包括分光光度计、气相或液相色谱法等,虽然这几种方法的测量灵敏度较高,但是由于其测试的过程较复杂,测试设备体积过大且耗时较长。因此研究一种测量溶液折射率微小变化的便捷方法。主要利用双面金属包覆波导的高阶模特性,从而实现了测量的高灵敏度。通过使用一种双金属包层波导结构,以待测样品作为其导波层,两层金属薄膜作为其包层。醋酸溶液和溴甲酚绿在波导引导层中消光系数的微小变化会导致反射光谱中光强度的显著变化。利用双面金属包覆波导的衰减全反射(attenuated total reflection)曲线对波导结构的灵敏响应从而实现了物质的痕量检测。理论模拟和实验结果均表明,该方法对乙酸的检测限可低至1.3 nm,与表面等离子体场增强共振散射(SP-RLS)方法相比,其性能提高了16倍,与火焰原子吸收光谱法和荧光光谱法相比,分别提高了4倍。该方法是一种耗时短、需样少、稳定性高、便捷且廉价的一种溶液浓度实时检测技术,为以后的化工生产流程提供了一种有效的检测路线。
