Session Index

Two kinds of long-wave pass filters (LWPF) were designed and prepared by an electron beam evaporation with ion-beam assisted deposition. The residual stress was -0.077 GPa and surface roughness was 2.24 nm for 19-layer LWPF. The residual stress was -0.193 GPa and surface roughness was 2.11 nm for 29-layer LWPF.

 

A newly designed InGaN/AlGaN multi-layer tunnel junction based on polarization engineering is proposed and systemically investigated. The simulation results demonstrate that excellent tunneling characteristics for this polarization-engineered InGaN/AlGaN multi-layer tunnel junction can be achieved owing to increased surface density, electric field and band bending in tunnel junction.

 

Head Up Display has been used in automobiles for several years, which has been proved to effectively improve safety. If Augmented Reality Head Up Display is used in locomotives, traffic safety will be greatly improved.

 

Periodic oscillation, aperiodic oscillation and their mixture were observed in vortex Q-switched laser and identified by phase space representation. Through the coherent coupling and competitions among the modes, Q-switched pulses in modes are anti-phased and leads to unusual second harmonic generation pumped by vortex laser.

 

This study proposed a novel grating interferometer combined with heterodyne interferometry, double-diffracting optical path and coplanar detection technology. Based on the above technical advantages, this system can simultaneously measure the double-degree-of-freedom displacement under a few optical components. It has high resolution and excellent measurement performance for in-plane and out-of-plane displacement.

 

This study is to design the deep ultraviolet UVC-LED package structure. Important thing is improve the light extraction and heat dissipation design.The result shows that the efficiency is closely related to the package width and it reaches 85% with the 96% substrate reflectivity and 6 mm width.

 

Prolonged screen watching might damage eyes. It even harms the body especially at night. We found the solution by using yellow text on black background with 15(lx) under the external light source of 1,800K color temperature. It permits 19.3 hours viewing time.

 

For the full screen of the smartphone, the in-display fingerprint recognition technology has arisen since this year. An ultra-thin camera is required for the under display fingerprint sensor due to the limited space of the smartphone. In this study, an ultra-thin wide-angle lens design is presented.

 

An optical design for automated optical inspection (AOI) is presented. There are nine optical components in the designed, where 2 aspheric ones included. The magnification varies from 0.025 to 0.14, and MTF no smaller than 70% at 47 lp/mm and 30% at 142 lp/mm. Performance test results are also presented.

 

A novel differential interference contrast microscope (DICM) based on the theories of shearing by using a Savart plate and phase-shifting by rotating analyzer is introduced in this paper, where the Savart plate is placed between the objective and sample to surmount the drawbacks of conventional DICM.

 

We demonstrate a broad light reflection in cholesteric liquid crystals (CLCs) using chiral monomers. After ultraviolet radiation, chiral monomers create a pitch-gradient distribution of the polymer network and broaden the reflection band of CLCs. An ultra-broad bandwidth covering the whole visible spectrum was achieved with 6 % chiral monomers.

 

In this study, we utilized a designated coded aperture instead of imaging lens to build up an imaging system with TFT-sensor. The coded aperture could be regarded as an unconventional imaging lens. With decoded algorithm, we effectively obtained an accurate image of object from an encrypted intermediate image.

 

Due to large variation of pore shape and wide tunability of resonance wavelength, porous metal nanoparticles have become important in biomedical applications. In this study, we develop numerical methods, based on the effective medium model, to investigate the optical properties of porous metal nanoparticles.

 

Through the light-driven self-assembly of gold nanorods, the single-crystalline gold nanowires were synthesized by the irradiation of a linearly-polarized(LP) laser. The process was conducted in a droplet of gold colloid on a glass irradiated by a LP near-infrared low-power laser at room temperature and atmospheric pressure without any chemical additive.

 

This paper proposes a new mathematical model that can simultaneously measure the thickness and refractive index of objects. With self-developed optical frequency coherence scanning, the experimental results show that the thickness measurement can be automated, the resolution is about 5 μm and the refractive index resolution is about 0.0045.

 

This study used COMSOL Multiphysics to simulate the adjustment of the beam shift caused by the phase difference to analyze the feasibility of an optical phase array for autonomous driving.

 

The Pseudo-Bessel beams with the properties of narrow lateral spot and gradient axial intensity distribution is adopted as a probe beam to generate an intensity-to-height conversion for profile measurement. The influences of the incident beam and the real lens with an oblate-tip shape on the axial probe beam are analyzed.

 

The non-invasive evaluation of blood glucose concentration is performed in this study. To perform a quantitative analysis, a calibration model investigated in this study allows the user to predict the blood glucose concentration of the tester from the reflection measurement using the broadband IR LED.

 

A birefringence nonlinear optic crystal is proposed for an optical angle sensor (OAS) in a polarization interferometer. The simulations show that the angle measurement sensitivity (AMS) can be improved by reducing a relative refractive index respect to environment with the BBO plate immersed in refractive index oil.

 

We propose a speckle reduction system for use in a laser pico-projector. Holographic diffusers and fast electrically tunable lens (FET lens) are adopted for speckle contrast reduction. The speckle contrast value can be further reduced by the incorporation of an FET lens.

 

Tunable long-period fiber grating is made in a few-mode optical fiber by using
periodic mechanical stress. The switching between single- and multi-wavelength resonance
can be achieved by adjusting the stress gradient along the fiber. The few-mode long-period
fiber grating has been successfully utilized in the generation of optical vector beams.

 

The study is to establish the technique of packaging a pump laser module with polarization maintaining (PM) fiber by PM fiber lens, positioning fiber ferrule (PFF), adjustable trench clip (ATC) to compensate the post weld shift (PWS) of a pump laser module with PMF with high coupling efficiency (CE).

 

In this study, an enzymatic modified cuvette was fabricated and adopts to measure the glucose concentration with heterodyne interferometer. The results indicated that the resolution of the proposed method was approximated of 3 mg/dl. The calibration curve showed high linearity within the dynamic range of 0 ~ 500 mg/dl.

 

We represent a three-dimensional surface with arbitrary profile by B-spline interpolation fitting. During the computational process, the number of control points was determined by the complexity of surface, which corresponding to polynomial regression problems. Without loss of generality, we expect to apply the proposed scheme upon more optical metrology purposes.

 

Based on employing cholesteric liquid crystal (CLC) and blue phase liquid crystal (BPLC) featured by high sensitivity to external stimuli, this work develops a tunable filter with narrow reflection bandwidth and wide tuning range. It is expected to be applied for realizing dynamic color weakness detection.

 

In order to improve the detection of the near-infrared band, the silicon photodetector should be involved physical mechanism about Schottky diode. In this study, when the photodetector receives the infrared light source from the silicon side, photodetector can have better performance. The mechanism is investigated.