We investigate a high sensitive chiral molecule detector based on Goos–Hanchen shift(S) in Kretschmann configuration involving chiral tri(diethylene glycol monobutyl) citrates(TDBCs). Fresnel equations and the statio...We investigate a high sensitive chiral molecule detector based on Goos–Hanchen shift(S) in Kretschmann configuration involving chiral tri(diethylene glycol monobutyl) citrates(TDBCs). Fresnel equations and the stationary phase method are employed to calculate S. Due to the interaction between surface plasmon polaritons and chiral TDBCs, S with chiral TDBCs are amplified at near the resonant wavelengths of chiral TDBCs. Our calculation results show that although the difference between the resonant wavelengths of left and right TDBCs is 4.5 nm, the positions of the largest S for the structures with left TDBCs and right TDBCs do not overlap. S reaches 400 times(or 200 times) the incident wavelength around the resonant wavelength of left TDBCs(or right TDBCs). The difference of S with chiral TDBCs(?S) can reach400 times or 200 times the incident wavelength in certain conditions, which can be directly observed in experiments. Left TDBCs and right TDBCs are easily distinguished. There is an optimal thickness of the metal film to realize the largest difference of S between Kretschmann configurations with left TDBCs and right TDBCs. Furthermore, we discuss the oscillator strength f, which is mainly determined by TDBC concentration. We find that our proposed detector is quite sensitive with f. By changing f from 0.008 to 0.014 with the step of 0.002, the change of ?S is no less than five times the incident wavelength(2.9 μm). Our proposed structure is very sensitive to the chirality and the concentration of TDBCs and has potential applications in distinguishing the chirality detector.展开更多
We investigate the enhanced chirality of chiral molecular J-aggregates(TDBC)by the propagating surface plasmons(PSPs)in the metallic hole array structure filled with TDBC.The two ends of the hole in the metal film for...We investigate the enhanced chirality of chiral molecular J-aggregates(TDBC)by the propagating surface plasmons(PSPs)in the metallic hole array structure filled with TDBC.The two ends of the hole in the metal film form a low quality factor Fabry-Perot(FP)cavity,and this cavity confines PSPs.The resonant wavelength of the metallic hole array is tuned by the lattice constant and the size of the hole.Both the resonant wavelength of Ag hole array and the volume ratio of TDBC in the hybridized structure influence on the enhancement of the circular dichroism(CD)spectrum.The curve of CD spectrum shows Fano-like line-shape,due to the interaction between the non-radiative field in the FP cavity and the radiative field in chiral TDBC.The maximum of the CD spectrum of the hybridized structure is 0.025 times as the one of the extinction spectrum in a certain structure,while the maximum of the CD spectrum of TDBC is 1/3000 times as the one of the extinction spectrum.The enhanced factor is about 75.The resonant wavelength of the metallic hole array can be tuned in a large wavelength regime,and the chirality of a series of molecular J-aggregates with different resonant wavelengths can be enhanced.Our structure provides a new method to amplify the chirality of molecular J-aggregates in experiments.展开更多
In the original version,Fig.5(f)is misused because it is identical to Fig.5(e).Figure 5 after correction is shown below:The authors apologize for any confusion.
In recent years,superhydrophobic coatings have received extensive attention due to their functions of waterproof,antifouling,self-cleaning,etc.However,wide applications of superhydrophobic coatings are still affected ...In recent years,superhydrophobic coatings have received extensive attention due to their functions of waterproof,antifouling,self-cleaning,etc.However,wide applications of superhydrophobic coatings are still affected by their disadvantages of complex preparation,low mechanical properties,and poor ultraviolet(UV)resistance.In this study,cellulose nanocrystal containing a small amount of lignin(L-CNC)/SiO_(2)composite particles were usedas the main material,polydimethylsiloxane(PDMS)as the adhesive and perfluorooctyltrichlorosilane(FOTS)as the modifier to prepare superhydrophobic coatings by a one-step spray method.The resulted coating showed excellent superhydrophobicity(water contact angle(WCA)of 161°and slide angle(SA)of 7)and high abrasion resistance(capable of withstanding 50 abrasion cycles under the load of 50 g).Moreover,it still maintained good superhydrophobicity after 5 h of exposure to the UV light(1000 W),displaying its good UV resistance.This study provides theoretical and technical referencefor thesimple preparationof organic-inorganic composite superhydrophobic coatings with high abrasion resistance and good UV resistance,which is beneficial to improving the practicability and broadening the application scope of superhydrophobic coatings.展开更多
基金supported by Science and Technology Nova Plan of Beijing City,China (Grant No. Z201100006820122)Fundamental Research Funds for the Central Universities,China。
文摘We investigate a high sensitive chiral molecule detector based on Goos–Hanchen shift(S) in Kretschmann configuration involving chiral tri(diethylene glycol monobutyl) citrates(TDBCs). Fresnel equations and the stationary phase method are employed to calculate S. Due to the interaction between surface plasmon polaritons and chiral TDBCs, S with chiral TDBCs are amplified at near the resonant wavelengths of chiral TDBCs. Our calculation results show that although the difference between the resonant wavelengths of left and right TDBCs is 4.5 nm, the positions of the largest S for the structures with left TDBCs and right TDBCs do not overlap. S reaches 400 times(or 200 times) the incident wavelength around the resonant wavelength of left TDBCs(or right TDBCs). The difference of S with chiral TDBCs(?S) can reach400 times or 200 times the incident wavelength in certain conditions, which can be directly observed in experiments. Left TDBCs and right TDBCs are easily distinguished. There is an optimal thickness of the metal film to realize the largest difference of S between Kretschmann configurations with left TDBCs and right TDBCs. Furthermore, we discuss the oscillator strength f, which is mainly determined by TDBC concentration. We find that our proposed detector is quite sensitive with f. By changing f from 0.008 to 0.014 with the step of 0.002, the change of ?S is no less than five times the incident wavelength(2.9 μm). Our proposed structure is very sensitive to the chirality and the concentration of TDBCs and has potential applications in distinguishing the chirality detector.
基金Project supported by the Fundamental Research Funds for the Central Universities and the National Key R&D Program of China(Grant No.2016YFA0301300).
文摘We investigate the enhanced chirality of chiral molecular J-aggregates(TDBC)by the propagating surface plasmons(PSPs)in the metallic hole array structure filled with TDBC.The two ends of the hole in the metal film form a low quality factor Fabry-Perot(FP)cavity,and this cavity confines PSPs.The resonant wavelength of the metallic hole array is tuned by the lattice constant and the size of the hole.Both the resonant wavelength of Ag hole array and the volume ratio of TDBC in the hybridized structure influence on the enhancement of the circular dichroism(CD)spectrum.The curve of CD spectrum shows Fano-like line-shape,due to the interaction between the non-radiative field in the FP cavity and the radiative field in chiral TDBC.The maximum of the CD spectrum of the hybridized structure is 0.025 times as the one of the extinction spectrum in a certain structure,while the maximum of the CD spectrum of TDBC is 1/3000 times as the one of the extinction spectrum.The enhanced factor is about 75.The resonant wavelength of the metallic hole array can be tuned in a large wavelength regime,and the chirality of a series of molecular J-aggregates with different resonant wavelengths can be enhanced.Our structure provides a new method to amplify the chirality of molecular J-aggregates in experiments.
文摘In the original version,Fig.5(f)is misused because it is identical to Fig.5(e).Figure 5 after correction is shown below:The authors apologize for any confusion.
基金supported by the National Natural Science Foundation of China(Grant No.31901246)the Natural Science Foundation of Zhejiang Province(Grant No.LY21C160002)the Scientific Research Development Foundation of Zhejiang A&F University(Grant No.2021KX0042).
文摘In recent years,superhydrophobic coatings have received extensive attention due to their functions of waterproof,antifouling,self-cleaning,etc.However,wide applications of superhydrophobic coatings are still affected by their disadvantages of complex preparation,low mechanical properties,and poor ultraviolet(UV)resistance.In this study,cellulose nanocrystal containing a small amount of lignin(L-CNC)/SiO_(2)composite particles were usedas the main material,polydimethylsiloxane(PDMS)as the adhesive and perfluorooctyltrichlorosilane(FOTS)as the modifier to prepare superhydrophobic coatings by a one-step spray method.The resulted coating showed excellent superhydrophobicity(water contact angle(WCA)of 161°and slide angle(SA)of 7)and high abrasion resistance(capable of withstanding 50 abrasion cycles under the load of 50 g).Moreover,it still maintained good superhydrophobicity after 5 h of exposure to the UV light(1000 W),displaying its good UV resistance.This study provides theoretical and technical referencefor thesimple preparationof organic-inorganic composite superhydrophobic coatings with high abrasion resistance and good UV resistance,which is beneficial to improving the practicability and broadening the application scope of superhydrophobic coatings.
