Session Index

Photonic systems, known for their manipulability of band structures, play a critical role in the study of topological matter. This paper investigated the topological properties of dielectric topological insulators using the spin Hall theoretical models, along with the numerical simulation method of finite-difference time-domain (FDTD). The influence of different excitation methods such as pseudo-spin phases, as well as the relative positions of excitation points, on the Chern number of various topological insulators is explored. These findings hold significant importance for a deeper understanding of the mechanisms of Chern numbers in photonic topological matter and topological phase transitions.

  Preview abstract

Long-term exposure to blue-enriched white light may lead to eye damages, especially for those used to reading or working under bright light. Reading illuminance may vary with multiple situations. Amongst, no study has yet investigated the effect of dark adaptation. We hence herein investigate the dark adaptation effect on reading illuminance. A lower illuminance was required when dark adaptation was applied. Initially, reading under white light requires a 33 lx. After a 5-minute dark adaptation, it decreases to 21 lx, and drops to 14 lx after 10 minutes. Moreover, utilizing candlelight shows 14 lx, 8 lx and 6 lx, respectively.

  Preview abstract

This study proposes a novel freeform lens design method for beam shaping of elliptical divergent laser diode (LD) beams. Conventional beam shaping of LD beams often involves using a combination of semi-cylindrical lens arrays or deformable prism arrays to correct the elliptical beam profile and achieve a nearly circular beam. In contrast, our proposed design, using a freeform surface lens, allows for transforming LD beams into rotationally symmetric collimated beams with customizable intensity distributions, using only a single lens.

  Preview abstract

We present fringe reflectometry combined with a sub-aperture stitching technique and fast Fourier transform to measure the surface profile of a 300 mm × 150 mm polished steel plate. The 3D surface contour and radius of curvature of the large polished steel plates can be obtained. The results show that the radius of curvatures in the X-axis and Y-axis directions are -76.606 m and -77.673 m, respectively.

  Preview abstract

Precision displacement measurement has been widely applied in various fields. In this study, we propose a speckle interference technology that can be used to measure in-plane and out-plane displacements. This technique integrates advantages of heterodyne techniques, asymmetric optical path designs, and speckle interferometry. It can provide nanometer-level in-plane and out-o-plane displacement measurement information without changing the system architecture.

  Preview abstract

Based on the photocatalytic principle, the study develops a portable air purifier that
utilizes the photocatalytic reaction generated by the UV-LED irradiation on titanium dioxide.
The TiO2 photocatalyst material is coated on acrylic beads with a diameter of about 1.5 mm
and attached to the irradiated surface to increase the effective area. In addition, optical design
software is used to construct a structure that optimizes the utilization of the UV LED
irradiation area. By incorporating a proper fan and using 3D printing technology, a portable
atmospheric air purifier is produced.


  Preview abstract

Collimator is popular used in optical testing in laboratory to simulate target in a distance. Glass plate with pattern is fundamental constitute of collimator focal plane, which should be placed precisely with respect to its optics. For collimator in used or to be built, it is necessary to check position of its focal plane. We develop a fast method to check focal plane position with interferometer. Results derived from this method we compared with that derived from angle deviation measurement method. Focal plane adjustment of imaging telescope can be performed with same way.

  Preview abstract

The design verification phase of the FORMOSAT-8 remote sensing satellites program's telescope has been passed, paving the way for the telescope’s implementation as the payload for the multi remote sensing satellite constellation of FORMOSAT-8, i.e., FORMOSAT-8A, FORMOSAT-8B, FORMOSAT-8C, FORMOSAT-8D, FORMOSAT-8E, and FORMOSAT-8F. This paper will present the report on the lens centering alignment performance of corrector lens in the FORMOSAT-8 remote sensing satellites program.

  Preview abstract

The quality control of optical substrates is necessary for precision manufacturing and application in various
industrial fields such as automobiles, aviation, semiconductors, displays, etc. This research develops a calculation method
to calculate the thickness and refractive index (RI) of an optical plate from a white light interference spectrum.
Considering the limitation of the resolution of the actual spectrum, this method uses 4 times the spectral resolution to
filter out the high-frequency oscillation spectral signal to determine the range of the spectrum that can be calculated.

  Preview abstract

The optical self-assembly of gold nanoparticles (GNPs) in a colloidal droplet caused by the irradiation of a linearly polarized laser in a microscope is studied. Different types of GNPs are used for investigation, including spherical GNPs, gold nanorods, nanocubes, and nanoplates. The self-assembly of these building blocks is induced by the optical forces due to the plasmonic effect. All the experiments are conducted in a microscopy. Through the driving optical forces and torques, these gold nanostructures assemble to form larger structures. Additionally, the photothermal effect causes annealing, leading to the transformation of the polycrystalline structure into a quasi-single crystal one.

  Preview abstract

The optomechanical behaviors of gold nanoparticle (GNP) dimer manipulated by a circularly polarized (CP) plane wave or Bessel beam are studied. Although a CP plane wave has only spin angular momentum (SAM) without orbital angular momentum (OAM), GNP dimer is driven to rotate along an orbit. The sign of orbital torque exerted on the dimer is size-dependent. Larger GNP dimers may generate a reverse rotation due to the negative optical orbital torque caused by higher-order modes. For a Bessel beam with OAM and SAM, a complicated gear motions of GNP dimer are observed. These behaviors involve the spin-orbit interaction.

  Preview abstract

The motion of a gold nanoparticle (nanosphere or nanorod) driven by a Bessel beam is studied to clarify the spin-orbit interaction (SOI). The orbital angular momentum (OAM) and spin angular momentum (SAM) of Bessel beam are transferred to the orbital and spin torques on the nanoparticle through the scattering and absorption. The ratio of orbital torque to spin torque upon a nanorod equals that of OAM to SAM. This illustrates that a gold nanorod is an effective sensor to probe the OAM and SAM of a vortex beam without inducing coupling. In contrast, the SOI via a nanosphere is serious.

  Preview abstract

This study investigates the color variation of mini-LED backlight modules owing to various conditioning parameters. These parameters result in changes in spectral distribution of the emitted white light owing to wavelength-dependent dispersion and absorptivity of the BSD. By employing white light color variation model, computing the color changes when the BSD and mechanical parameters are altered. As thickness increases, the white light’s color temperature change linearly (slope close to 10K/mm). As concentration increases, the white light’s color temperature changes slightly irregularly, change is within ±0.2K. The differences and ranges of color variations will be observed and compared to MacAdam ellipses.

  Preview abstract

A confocal Raman system is used in this study to present the three dimensional mapping results. The fabricated silver nano structures chips using thin silver layer treated with rapid thermal anneal at 400oC have good Raman results in measuring the Raman peak of 10-
6M R6G compared with the commercial chips. Two dimensional and three dimensional resultsof fabricated chips and commercial chips successfully verify the precise Z-axis positioning of the confocal Raman system.

  Preview abstract

Most flashlights usually provide non-uniform illumination. On the other hand, many applications do require uniform illuminance. We have designed flashlights based on optical theorem and optical software and produced real flashlights with off-the-shelf optical lenses and LED sources, resulting in sufficient uniform illuminance. To achieve uniformity with Lambertian light sources, the optical theorem shows that a constrain equation related to the slope angle of any emitted ray from the on-axis source point and its final ray height on the image plane must be satisfied. The theorem was adopted and written into an optimization program, achieving high-quality uniformity.

  Preview abstract

Azimuthally/radially symmetric liquid crystal panels often have problems aligning the center of symmetry during production. By using dichroic dyes methyl red and brilliant yellow to carry out a two-step photo-alignment, the adjustment process can be omitted to avoid the abrasion of the alignment film and the change of cell gap during the process.

  Preview abstract

In this research, we proposes a single-shot optical sectioning microscope and used it to measure standard step heights of 3 µm . This paper demonstrates the configuration, inspection concept, experimental setup, and experimental results of the proposed single-shot optical sectioning microscope. The contrast of the structured light is extracted using a three-step phase-shifting method. This research overcomes the illumination deficiency in traditional optical sectioning microscopes. The structured light in this experiment has the ability to perform single-shot measurements without distortion and offers higher resolution.

  Preview abstract

A long-distance optical communication with a 40 Gb/s high data rate needs a dispersion compensator to fiber dispersion. The papers suggest employing a multi-layer perceptron neural network model instead to optimize WDM receiver sensitivity to improve the transmission quality.

  Preview abstract

The design verification phase of the FORMOSAT-8 remote sensing satellites program's telescope has been passed, paving the way for the telescope’s implementation as the payload for the multi remote sensing satellite constellation of FORMOSAT-8, i.e., FORMOSAT-8A, FORMOSAT-8B, FORMOSAT-8C, FORMOSAT-8D, FORMOSAT-8E, and FORMOSAT-8F. This paper will present the report on the optical design methodology of the catadioptric optical system for the FORMOSAT-8 remote sensing instruments.

  Preview abstract

The optical design of the wide angle camera for the FLUTE is described. The FLUTE payload is composed of a pair of wide angle camera, for observing in UVa and VIS/NIR spectral range. Each of camera is an F/4.0 objective lens with a wide 80⁰ x 67⁰ field of view. To satisfy the scientific requirements for spatial resolution, contrast capability, spectral coverage and a rather long back focal distance, a retro-focus configuration with achromatic optical design has been adopted. The mass and volume of objective lens are considered to satisfy the payload within 5U in size, 5kg in weight.

  Preview abstract