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The coupled microring resonators interference is discussed and applied to intensity sensing. Relaxed from the requirement of high quality factor, better performance of the coupled MR intensity sensor compared with conventional MR sensor is demonstrated by the transfer matrix theory.
A three-terminal optical sensor by using an aluminum-doped zinc oxide (AZO)-gated Al0.2Ga0.8As/In0.2Ga0.8As high electron mobility transistor (AZO-HEMT) on a GaAs substrate is demonstrated in this report. Optical responses under illumination of different wavelengths are investigated, as compared to a conventional Au-gated HEMT device. Experimental results demonstrate that the present design is promising...
The optical local oscillator power which makes the maximized signal-to-noise ratio is analyzed. Aiming at photovoltaic detector, the optimum optical local oscillator power is researched, and the theoretic value of optimum optical local oscillator power is acquired, and takes some experimental research basing on the theory.
Terahertz time-domain spectroscopy is a newly developed technique, which can provide a direct fingerprint spectroscopy of the molecular structure or conformational state of a compound. The relationship between the optical activity of some amino acids and their THz spectroscopy is presented. Based on their THz spectroscopy these amino acids are precisely clustered into three kinds: L-s D-s and DL-s...
This paper proposes a method called Jump method for optimization of optical thin films. The method is a kind of hybrid approach. It is the combination of local search strategy using modified Coordinate-Wise Algorithm and global search strategy using modified Evolutionary Algorithm. Jump method was successfully applied to the design of a dielectric beam splitter. The result indicates that Jump method...
In this paper, a new type of gaussian-shaped metallic nano-grating surface plasma resonance (NGSPR) biosensors and the design optimization process are presented in nano fabrication point of view. The influence of structural factors of nano- corrugations on the sensitivity of NGSPR sensors was investigated using the multiple multipole program (MMP) method. Biosensors with the line width of the gaussion...
An improved phase unwrapping algorithm based on quality-guided is presented. In an optical 3D sensing technology with structure light projection, phase unwrapping is an unavoidable and critical step. For a complex object especially with discontinuities, the exiting quality-guided algorithm is not efficient enough. An improved phase unwrapping algorithm which minimizes the cost along the path of unwrapping...
Au/Si-NPA composite materials were fabricated by immersion plating method based on a substrate-silicon nanoporous pillar array(Si-NPA). Its surface morphology and optical absorption property were investigated. The optical absorption curves of the samples indicated that compared to pure Au nanoparticles, Surface Plasmon Resonance (SPR) peak of Au nanoparticles in the samples appeared a large blue-shift...
The research on the localized surface plasmon resonance (LSPR) sensors is one of the hottest issues in sensor technology fields. The LSPR sensors have obvious technology advantages in physical and chemical, especially biological detection and analysis. This review introduces the theoretical model, fabrication and application of LSPR sensors. Meanwhile, the future development and commercial views of...
Laser protection materials based on linear effect are only sensitive to optical wavelength, which are protection materials against optical wavelength, while laser protection materials based on nonlinear principle and phase transition effect are the protection materials against optical intensity, which can overcome the defects of linear protection materials, and are expected to realize multi-wavelength...
Holographic variable line space grating has the advantage of self focusing and aberration-reduced. They have been used in a wide variety of spectrograph and synchrotron radiation facilities. In recent years, a new fiber optic position sensor based on holographic variable line space plane grating is developed. In this paper, we briefly describe the theoretical background to the position sensor. In...
Space optical technique is a key research issue of space technique. Along with the development of earth observation and space exploration, requirements of observation accuracy and resolution capability is becoming higher and stricter. Traditional optical systems could hardly satisfy demands of modern optical remote sensing. Consequently, various countries begin their research on optical synthetic...
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