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Optics at Surfaces|5 Article(s)
THE EFFECT OF TRANSMMITANCE LIGHT OBSTRUCTED BY LIQUID SURFACE AND ITS APPLICATION
[in Chinese], [in Chinese], and [in Chinese]
Acta Photonica Sinica
- Publication Date: Apr. 01, 2002
- Vol. 31, Issue 4, 489 (2002)
Laser Speckle Suppression Based on Tunable Metasurface
Jin CHENG, Shun ZHOU, Xue-ping SUN, Xin-xin PU, Qi-liang SUN, Ying-shun XU, and Wei-guo LIU
In order to suppress laser speckle, a metasurface structure with high transmittance and random phase function is designed, which utilizing the basic idea of time-averaged suppression speckle theory. Then integrated with MEMS technology, the design and manufacture of micro-rotation stages is realized, and to achieve a ultra-small speckle suppression device. The experimental results show that the laser speckle contrast can be reduced to 2.63%, which meets the needs of laser projection. This novel laser speckle suppression device is simple in use, high in energy utilization rate, low in cost, and easy to mass-produce. In order to suppress laser speckle, a metasurface structure with high transmittance and random phase function is designed, which utilizing the basic idea of time-averaged suppression speckle theory. Then integrated with MEMS technology, the design and manufacture of micro-rotation stages is realized, and to achieve a ultra-small speckle suppression device. The experimental results show that the laser speckle contrast can be reduced to 2.63%, which meets the needs of laser projection. This novel laser speckle suppression device is simple in use, high in energy utilization rate, low in cost, and easy to mass-produce.
Acta Photonica Sinica
- Publication Date: Aug. 25, 2020
- Vol. 49, Issue 7, 724001 (2020)
Aluminum-graphene Structure Based on Phase Modulation Employed for Biosensing
Yong-ping LI, Jun-xian LIU, and Yu-feng YUAN
In order to further improve the sensitivity and stability of aluminum-based plasmonic sensor, a plasmonic configuration named aluminum-graphene hybrid structure, was proposed based on phase modulation. Employing a high refractive index prism, the plasmonic configuration excited by the Kretschamnn mode, was designed by depositing graphene layers onto aluminum film. With the help of the transmission matrix theory, the variation of geometry parameters on sensing performance was studied when the excitation wavelength With the help of the transmission matrix theory, the variation of geometry parameters on sensing performance was studied when the excitation wavelength was set to 632.8 nm. The calculated results show that, the proposed aluminum-graphene hybrid structure designed by phase modulation have provided 2 orders of magnitude higher sensitivity compared with conventional surface plasmon resonance sensors designed by angular modulation. Moreover, the introduction of graphene can not only efficiently hinder the oxidation of plasmonic aluminum film, but also enhance the detection sensitivity as high as 83 times. For a tiny refractive index variation of 1.333~1.334 2 in sensing interface, the proposed configuration can provide a higher phase change of 94.663° and a phase detection sensitivity as high as 7.888 5×104 o/RIU. The proposed surface plasmon resonance configuration can provide a reference for designing low-cost and ultrasensitive plasmonic sensors. In order to further improve the sensitivity and stability of aluminum-based plasmonic sensor, a plasmonic configuration named aluminum-graphene hybrid structure, was proposed based on phase modulation. Employing a high refractive index prism, the plasmonic configuration excited by the Kretschamnn mode, was designed by depositing graphene layers onto aluminum film. With the help of the transmission matrix theory, the variation of geometry parameters on sensing performance was studied when the excitation wavelength With the help of the transmission matrix theory, the variation of geometry parameters on sensing performance was studied when the excitation wavelength was set to 632.8 nm. The calculated results show that, the proposed aluminum-graphene hybrid structure designed by phase modulation have provided 2 orders of magnitude higher sensitivity compared with conventional surface plasmon resonance sensors designed by angular modulation. Moreover, the introduction of graphene can not only efficiently hinder the oxidation of plasmonic aluminum film, but also enhance the detection sensitivity as high as 83 times. For a tiny refractive index variation of 1.333~1.334 2 in sensing interface, the proposed configuration can provide a higher phase change of 94.663° and a phase detection sensitivity as high as 7.888 5×104 o/RIU. The proposed surface plasmon resonance configuration can provide a reference for designing low-cost and ultrasensitive plasmonic sensors.
Acta Photonica Sinica
- Publication Date: Aug. 25, 2020
- Vol. 49, Issue 7, 724002 (2020)
Progress in Wafer-level Metasurface-based Flat Optics（Invited）
Yuan DONG, Qize ZHONG, Yongjian ZHENG, Shaonan ZHENG, Ting HU, and Yuandong GU
Metasurface is composed of many sub-wavelength metastructures that can be fabricated in a flat surface using CMOS process. Light can be precisely controlled by a metasurface through the specificly designed shape and arrangement of metastructures. This enables metasurfaces to realize same funcitons as conventional optical devices. In recent years, metasurface-based flat optic devices have attracted great attention since they are ultrathin, ultralight, mass-producible, and can be monolithically integrated with other optoelectronic devices. Ultraviolet photolithography based wafer-level fabrication has been considered as one of the most promising approaches for the mass-production of metasurface-based flat optic devices. In this article, recent progress in wafer-level metasurface-based flat optics is reviewed. Optical devices such as metalens, polarization bandpass filter, half-wave plate, perfect absorber, and beam deflector are demonstrated on different types of wafers with various diameters. Metasurface is composed of many sub-wavelength metastructures that can be fabricated in a flat surface using CMOS process. Light can be precisely controlled by a metasurface through the specificly designed shape and arrangement of metastructures. This enables metasurfaces to realize same funcitons as conventional optical devices. In recent years, metasurface-based flat optic devices have attracted great attention since they are ultrathin, ultralight, mass-producible, and can be monolithically integrated with other optoelectronic devices. Ultraviolet photolithography based wafer-level fabrication has been considered as one of the most promising approaches for the mass-production of metasurface-based flat optic devices. In this article, recent progress in wafer-level metasurface-based flat optics is reviewed. Optical devices such as metalens, polarization bandpass filter, half-wave plate, perfect absorber, and beam deflector are demonstrated on different types of wafers with various diameters.
Acta Photonica Sinica
- Publication Date: Oct. 25, 2021
- Vol. 50, Issue 10, 1024002 (2021)
Anisotropic Surface Plasmon Resonance Spectroscopy and Infrared Sensing Properties Employing Graphene-Black Phosphorus Heterostructure（Invited）
Peng LUO, Wei WEI, Guilian LAN, Rong CHEN, Xiaojian ZHANG, Jinpeng NONG, Yan LIU, and Genquan HAN
The surface plasmon device based on single-layer black phosphorous exhibits low light absorption. To address this issue, an anisotropic graphene-black phosphorus heterostructure plasmonicresonator is proposed, and the resonance spectrum and infrared sensing characteristic are studied. The designed graphene-black phosphorus heterostructure and asymmetric Fabry-Perot-like structure can improve the excitation efficiency of surface plasmons. It is found that the absorption of the proposed device can reach to 95.54% and 97.44% along x- and y-directions, respectively, by optimizing the thickness of dielectric layer of optical resonator. In addition, by changing the polarization direction of incident light to dynamically adjust the resonant wavelength, the maximum enhancement factor of 88 and 155 can be achieved for detecting v(COC)s and r(CH2)a modes of polyethylene oxide molecular film with the thickness of 8 nm. The proposed anisotropic device with waveband tunable, high enhancement factor is expected to have the great potential applications in the detection of trace level samples. The surface plasmon device based on single-layer black phosphorous exhibits low light absorption. To address this issue, an anisotropic graphene-black phosphorus heterostructure plasmonicresonator is proposed, and the resonance spectrum and infrared sensing characteristic are studied. The designed graphene-black phosphorus heterostructure and asymmetric Fabry-Perot-like structure can improve the excitation efficiency of surface plasmons. It is found that the absorption of the proposed device can reach to 95.54% and 97.44% along x- and y-directions, respectively, by optimizing the thickness of dielectric layer of optical resonator. In addition, by changing the polarization direction of incident light to dynamically adjust the resonant wavelength, the maximum enhancement factor of 88 and 155 can be achieved for detecting v(COC)s and r(CH2)a modes of polyethylene oxide molecular film with the thickness of 8 nm. The proposed anisotropic device with waveband tunable, high enhancement factor is expected to have the great potential applications in the detection of trace level samples.
Acta Photonica Sinica
- Publication Date: Oct. 25, 2021
- Vol. 50, Issue 10, 1024001 (2021)
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