Session Index

In this paper, a polarization interferometer was proposed to measure the full-field refractive index. This apparatus is designed based on the concept of Twyman-Green interferometer, so it has the advantages of simple structure, easy operation and high accuracy. In the experiment, a BK7 plate glass and a quartz glass have been used to verify the feasibility of this method, and the measurement error can be controlled within 2%.

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The surface spectral reflectance recovery was experimentally investigated using incandescent lamps and synthetic white lamps, respectively. Two ColorCheckers were used as samples. Sample images were captured with a camera. The results show that the experimental results agree with the stimulation results well. The mean root mean square error of the spectral reflectance recovered using incandescent lamps is lower than that of synthetic white lamps.

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This study focuses on the simulation and measurement of infrared absorption of microplastics. The measuring configuration consists of an infrared light source, a collimating lens, the sample in a cuvette, a focusing lens and a detector. The tested samples includes different numbers of microplastic spheres in air and in water. Moreover, an optical simulation software ASAP is used to simulate the optical measurements. When 1000 microplastics are immersed in water, the change in transmitted intensity is measured to be approximately 23%. The simulated value for the same setup is around 26%. The experimental and simulated results are highly consistent.

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We demonstrated a custom-built phosphorescence and fluorescence lifetime system, which featured measuring range from 0.1 ns to 5 μs, and temporal resolving power of <0.1 ns. In order to achieve the selected temporal range of lifetime measurement, we performed multi-frequency harmonics excitation to the luminescence materials. The homodyning system included a FPGA card which provided fundamental frequency to modulate the PMT, and chosen harmonics for LEDs modulation. As high-power multi-die LEDs were used, simultaneous and alternative measurements of phosphorescence and fluorescence lifetimes were made possible. This system might contribute to the study of advanced luminescence device and complex biomedical systems.

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A single layer of amorphous InWO is chosen as the channel material for a thin film transistor (TFT)-based driver and sensing layer for a blue-light sensor, respectively, with a completely compatible process integrated into in-cell embedded photo sensor architecture. The photo sensor exhibits a high optical responsivity and good signal to noise ratio under the blue light illumination. Afterwards, the detail studies and important issues about the sensing and material characteristics of a-IWO thin film in the TFT sensor are discussed.

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We design a metamaterial for reflective terahertz time-domain spectroscopy. The ability of metamaterials in modulating terahertz waves has attracted people's attention, but conventional micro-nano fabrication encounters the limitation of unit cell size, requiring complex steps and expensive equipment. To overcome these obstacles, we propose a 3D-printed terahertz metamaterial sensor for multi-frequency sensing using a simple double-slit configuration. Using the finite element method, the absorption spectra, electromagnetic field distribution, and blood component sensing capabilities of the metamaterials were evaluated. Our work highlights the potential of the designed metamaterial fabrication process.

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Recently, research on dual-mode biosensors has been gaining increasing interest to
improve the performance of biosensors. In this paper, a computational study is carried out on
SPR chips modified with AuNPs. AuNPs of different sizes were investigated for their SPR
curves and field enhancement factors. The results of this numerical investigation are expected
to be used as a basis for the development of a dual mode biosensor based on SPR/SERS.

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Surface-enhanced Raman scattering (SERS) is a technique that cooperates excitation laser spectroscopy along with the characteristic of nanostructured materials, consequently boosting Raman signals. SERS substrate is developed to detect many kinds of different biomolecules. Al-decorated nitride SERS substrate was fabricated for DNA detection, which was expected for practical application. In that, investigating DNA molecules have been reported in various studies. This SERS substrate can detect a 19-mer DNA with the concentration down to 1E-6 M by using 488nm excitation laser wavelength.

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This study utilizes silicon photonics SOI as the structure to design a wavelength demultiplexer, serving as a simplified spectrometer. The demultiplexing principle involves the use of directional couplers, with adjustable parameters to design four-wavelength wavelength demultiplexers. The dimensions of the device are 250.5 μm in length and 3.6 μm in width, achieving an extinction ratio of 26.9 dB.

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Optical identification (OID) is a technology that can hide digital data and capture
hidden digital data in general printed materials, which can be hidden in general printed
materials through standard printing procedures and standard inks, and coexist with the original
patterns on the printed materials. Through the optical and image processing technology of the
OID Pen, the data hidden in the print can be retrieved. We propose a new idea for the structure
of the OID Pen tip.

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We propose a Mach-Zehnder interferometer fiber sensor formed by filling liquid crystals into a hollow-core fiber (HCF). With the help of MMF, the interference of the cord mode and cladding mode of the HCF can be successfully induced to form a MZI. The measured results show that the temperature sensitivity can be as high as to 825.79 pm/℃ with the strain sensitivity is 2.87 pm/με.

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As the chip has a higher performance and efficiency, devices are made more denser,
making the heat dissipation an important engineering problem. In the study, we realize a
flexible and high-performance photodetector with an effective thermal management through
the use of a graphite substrate. The device can be completely bent with a radius of curvature of
1 cm. After being bent 1000 times, the photodetector still has outstanding photoresponse,
indicating that it has the excellent potential for the applications of flexible systems.

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By employing automated control to perform frequency scanning, time needed for manual measurement of resonance frequency and Q facto of quartz oscillator is reduced. Furthermore, integration of data acquisition and processing systems allows for real-time data acquisition and fitting.

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This research focuses on the growth of Ga2O3 nanostructures by hydrothermal method and investigates their properties as photodetectors. Gallium oxide (Ga2O3) is a promising material for optoelectronic applications due to its wide bandgap and high electron mobility. The study involved the synthesis of Ga2O3 nanostructures using the hydrothermal method, followed by structural characterization using techniques such as XRD and SEM. Photodetectors were fabricated using Ga2O3 nanostructures annealed at various temperatures, and their performance in terms of responsivity, response ratio, and switch-on time was systematically examined. This study provides valuable insights into utilizing Ga2O3 nanostructures for high-performance photodetection devices.

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The spectra image data could be used to estimate the distribution of different types of sediment particles in the sediment core, and based on this, the specific benefits of this integrated system in marine sediment cores. The sample of sediment core, the die seagrass was deposition within. The hyperspectral image and reflectance image of sediment core were presented for discussion.

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A Cd3As2/CdZnTe/Si heterostructure was grown by MBE to be used as a photodetector, with photocurrent being detected from 375 nm to 4.6 µm wavelength. Under an exposed light of 1064 nm wavelength, the photoresponsivity was measured to be 0.52 A/W, with an on/off current ratio of 1.3 × 106 and detectivity of 5.5 × 1011 Jones. While the on/off photoresponse time under 405 nm wavelength was 3.4/67.3 µs.

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