We study the sensing properties of an intensity-modulated fiber-optic surface plasmon resonance （SPR） sensor using radially polarized beam （RPB）. Because of the rotational symmetry of fiber and RPB, surface plasmo...We study the sensing properties of an intensity-modulated fiber-optic surface plasmon resonance （SPR） sensor using radially polarized beam （RPB）. Because of the rotational symmetry of fiber and RPB, surface plasmon can be excited more efficiently at the sensor surface, which results in an obvious improvement of the sensitivity. Our experiments demonstrate that the sensitivity in the case of RPB illumination is three times higher than that of linearlv polarized beam illumination.展开更多
Light propagation through a metal/nonlinear dielectric material/metal（M-NL-M） structure is numerically studied.The design parameters of the M-NL-M structure are found with the waveguide theory so that the structure ...Light propagation through a metal/nonlinear dielectric material/metal（M-NL-M） structure is numerically studied.The design parameters of the M-NL-M structure are found with the waveguide theory so that the structure only supports the symmetric surface plasmon polaritons（SPP（0）） mode and the antisymmetric surface plasmon polaritons（SPP（1）） mode.The coupling between the two modes within the M-NL-M structure is exploited.Through controlling the propagation constants of the two modes with the intensity-dependent dielectric constant of the nonlinear Kerr material,an effective all-optical control of plasmonic signal modulator can be realized with this M-NL-M structure.展开更多
We demonstrate an all fiber passively mode-locked laser emitting a radially polarized beam by using a few-mode fiber Bragg grating to achieve mode selection and spectrum filtering. An offset splicing of single-mode fi...We demonstrate an all fiber passively mode-locked laser emitting a radially polarized beam by using a few-mode fiber Bragg grating to achieve mode selection and spectrum filtering. An offset splicing of single-mode fiber with four-mode fiber is utilized as a mode coupler in the laser cavity. Carbon nanotubes are introduced into the laser cavity as the saturable absorber to achieve self-start mode locking. The laser operates at 1547.5 nm with a narrow spectrum width of 0.3 nm at 30 d B. The emitted mode-locked pulses have a duration of 22.73 ps and repetition of10.61 MHz. A radially polarized beam has been obtained with high mode purity by adjusting the polarization in the laser cavity.展开更多
A vectorial optical field generator(VOF-Gen) based on two reflective phase-only liquid crystal spatial light modulators enables the creation of an arbitrary optical complex field. In this work, the capabilities of the...A vectorial optical field generator(VOF-Gen) based on two reflective phase-only liquid crystal spatial light modulators enables the creation of an arbitrary optical complex field. In this work, the capabilities of the VOF-Gen in terms of manipulating the spatial distributions of phase, amplitude, and polarization are experimentally demonstrated by generating a radially polarized optical field consisted of five annular rings, the focusing properties of which are also numerically studied with vectorial diffraction theory. By carefully adjusting the relative amplitude and phase between the adjacent rings, an optical needle field with purely longitudinal polarization can be produced in the focal region of a high numerical aperture lens. The versatile method presented in this work can be easily extended to the generation of a vectorial optical field with any desired complex distributions.展开更多
In a photonic crystal composed of anisotropic constituents we quantify the range of input angles and the degree of collimation of the beam inside the crystal. The optical properties of a photobleached 4- dimethylamino...In a photonic crystal composed of anisotropic constituents we quantify the range of input angles and the degree of collimation of the beam inside the crystal. The optical properties of a photobleached 4- dimethylamino-N-methyl-4-stilbazolium-tosylate （DAST） crystal are used in our model to demonstrate the efficacy of the self-collimation features.展开更多
Plasmonic field enhancement in a fully coated dielectric near field scanning optical microscope （NSOM） probe under radial polarization illumination is analyzed using an axially symmetric three-dimensional （3D） fin...Plasmonic field enhancement in a fully coated dielectric near field scanning optical microscope （NSOM） probe under radial polarization illumination is analyzed using an axially symmetric three-dimensional （3D） finite element method （FEM） model. The enhancement factor strongly depends on the illumination spot size, taper angle of the probe, and the metal film thickness. The tolerance of the alignment angle is investigated. Probe designs with different metal coatings and their enhancement performance are studied as well. The nanometric spot size at the tip apex and high field enhancement of the apertureless NSOM展开更多
This Special Topic Issue has grown out of research that has been highlighted at the Nanophotonics Conference series held in China for the past three years. The fourteen papers appearing in this issue are a small sampl...This Special Topic Issue has grown out of research that has been highlighted at the Nanophotonics Conference series held in China for the past three years. The fourteen papers appearing in this issue are a small sampling of the total scope of the Conference. Broadly speaking, the subjects covered by the contributing authors include quantum properties using semiconductor materials, nanocharacterization especially with applications to medical fields, photonic crystals and fibers, and plasmonics.展开更多
基金supported by the National Basic Research Program of China (No.2006cb302905)the Key Program of National Natural Science Foundation of China (No.60736037)+1 种基金the National Natural Science Foundation of China (No.10704070)P.Wang was also supported by the Science and Technological Fund of Anhui Province for Outstanding Youth (No.08040106805)
文摘We study the sensing properties of an intensity-modulated fiber-optic surface plasmon resonance （SPR） sensor using radially polarized beam （RPB）. Because of the rotational symmetry of fiber and RPB, surface plasmon can be excited more efficiently at the sensor surface, which results in an obvious improvement of the sensitivity. Our experiments demonstrate that the sensitivity in the case of RPB illumination is three times higher than that of linearlv polarized beam illumination.
基金supported by the National Key Basic Research Program of China(No.2006CB302905)the Key Program of National Natural Science Foundation of China(No.60736037)+1 种基金the National Natural Science Foundation of China(Nos.10704070 and 60977019)the Science and Technological Fund of Anhui Province for Outstanding Youth(No.08040106805).
文摘Light propagation through a metal/nonlinear dielectric material/metal（M-NL-M） structure is numerically studied.The design parameters of the M-NL-M structure are found with the waveguide theory so that the structure only supports the symmetric surface plasmon polaritons（SPP（0）） mode and the antisymmetric surface plasmon polaritons（SPP（1）） mode.The coupling between the two modes within the M-NL-M structure is exploited.Through controlling the propagation constants of the two modes with the intensity-dependent dielectric constant of the nonlinear Kerr material,an effective all-optical control of plasmonic signal modulator can be realized with this M-NL-M structure.
基金National Natural Science Foundation of China(NSFC)(61275049)
文摘We demonstrate an all fiber passively mode-locked laser emitting a radially polarized beam by using a few-mode fiber Bragg grating to achieve mode selection and spectrum filtering. An offset splicing of single-mode fiber with four-mode fiber is utilized as a mode coupler in the laser cavity. Carbon nanotubes are introduced into the laser cavity as the saturable absorber to achieve self-start mode locking. The laser operates at 1547.5 nm with a narrow spectrum width of 0.3 nm at 30 d B. The emitted mode-locked pulses have a duration of 22.73 ps and repetition of10.61 MHz. A radially polarized beam has been obtained with high mode purity by adjusting the polarization in the laser cavity.
文摘A vectorial optical field generator(VOF-Gen) based on two reflective phase-only liquid crystal spatial light modulators enables the creation of an arbitrary optical complex field. In this work, the capabilities of the VOF-Gen in terms of manipulating the spatial distributions of phase, amplitude, and polarization are experimentally demonstrated by generating a radially polarized optical field consisted of five annular rings, the focusing properties of which are also numerically studied with vectorial diffraction theory. By carefully adjusting the relative amplitude and phase between the adjacent rings, an optical needle field with purely longitudinal polarization can be produced in the focal region of a high numerical aperture lens. The versatile method presented in this work can be easily extended to the generation of a vectorial optical field with any desired complex distributions.
文摘In a photonic crystal composed of anisotropic constituents we quantify the range of input angles and the degree of collimation of the beam inside the crystal. The optical properties of a photobleached 4- dimethylamino-N-methyl-4-stilbazolium-tosylate （DAST） crystal are used in our model to demonstrate the efficacy of the self-collimation features.
基金Weibin Chen is supported by the Dayton Area Gradu-ate Studies Institute(DAGSI)Research Fellowship.
文摘Plasmonic field enhancement in a fully coated dielectric near field scanning optical microscope （NSOM） probe under radial polarization illumination is analyzed using an axially symmetric three-dimensional （3D） finite element method （FEM） model. The enhancement factor strongly depends on the illumination spot size, taper angle of the probe, and the metal film thickness. The tolerance of the alignment angle is investigated. Probe designs with different metal coatings and their enhancement performance are studied as well. The nanometric spot size at the tip apex and high field enhancement of the apertureless NSOM
文摘This Special Topic Issue has grown out of research that has been highlighted at the Nanophotonics Conference series held in China for the past three years. The fourteen papers appearing in this issue are a small sampling of the total scope of the Conference. Broadly speaking, the subjects covered by the contributing authors include quantum properties using semiconductor materials, nanocharacterization especially with applications to medical fields, photonic crystals and fibers, and plasmonics.
