Session Index

Non-Hermitian metasurfaces can exhibit unique and unconventional optical behaviors due to the interaction between gain and loss, including effects like unidirectional reflection, nonreciprocal transmission, and enhanced sensitivity. Here, we designed a plasmonic non-Hermitian metasurface operating at an exceptional point (EP) for asymmetric reflection, and introduced Pancharatnam-Berry (PB) phase to achieve abnormal reflection of two degenerate circular polarized (CP) light under linear polarized (LP) light incidence.

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This study proposed a high-quality fiber ring laser combining four-subring resonators and a saturable absorber within a ring cavity. A non-pumped erbium-doped fiber (EDF) is introduced as the saturable absorber (SA) within the ring structure. we arrange four subrings with different lengths to form the four-subring resonators, achieving a single-longitudinal-mode (SLM) operation. At a pump power of 100 mW, the laser maximum power and wavelength deviations during a one-hour test were measured to be 0.01 dB and 0.059 nm, respectively. we measured an ultra-narrow linewidth of 620 Hz.

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Most metasurfaces suffer from low reflection efficiency in practical applications because they typically focus only on the phase profile during component design. To enhance their real-world applicability, we have developed a method that incorporates amplitude modulation into the design of beam deflection metasurfaces. With our approach, we have achieved a significant improvement in deflection efficiency, increasing it by approximately 60% for a 5° deflection angle and around 39% for a 25° deflection angle.

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The research is to improve the efficiency of light transmission through a light guide with two volume holographic optical elements (VHOE). When light transmit in light guide, the angle tolerance causes filtering effects on mismatch wavelengths. To solve this problem, we simulate the wavelength distribution by using VOHIL after passing through the hologram. By recording the dispersive elements, the required wavelength distribution is created in order to direct different wavelengths to different angles. In addition, through the combination of phase superposition and dispersion elements, which utilizes the energy of the light source more efficiently and enhance the optical system efficiency.


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In this study, an electrically tunable color filter has been demonstrated based on the modulation of heliconical structures of chiral nematics. In contrast to conventional chiral nematics with a bend elastic constant ( K33) larger than a twist one (K22), the chiral nematics with K33 smaller than K22 can maintain their helical textures while raising applied voltages. Apart from the demonstration of the tunability of heliconical structures, the structural information for the heliconical applied with different voltages has been extracted by the simulated spectra successfully.

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In our study, we design and fabricate an optical combiner based on a SiNx dielectric grating to serve as a reflective filter with an incident angle of 58 degrees. By optimizing the structural parameters with Rigorous Coupled Wave Analysis (RCWA), the spectral positions of Leaky Bloch mode and Mie resonance of the one-dimensional grating can be tuned to produce a high reflectivity of 78% at a wavelength of 500nm for the transverse-magnetic (TM) polarization. Additionally, a two-dimensional grating filter with a reflectivity of 73% at 532nm wavelength is designed, which is insensitive to the polarization of the incident light.

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In this study, we present we present a Michelson interferometer to measure the phase change of the spatial light modulators (SLMs). In addition, we also compare the deflection angle and deflection efficiency of the beam under different periodic blazed gratings. Finally, at the maximum deflection angle of ±3.7°, the diffraction efficiency reaches 53%, and the side mode suppression ratio (SMSR) is lower than 3dB.

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Long-term exposure to blue-enriched computer screen backlight may lead to eye strain and discomfort, affecting concentration. To investigate, we attempted herein using typing speed to reflect the concentration under the influence of blue light. The results showed the typing speed to decrease from 25 words per minute to 23 after reading a novel with a traditional black text on white background for 30 minutes. Upon switching to a white text on dark background, the typing speed surprisingly increased from 24 words to 26, indicating blue light to have a profound effect on concentration.


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In this study, three wavelengths of 1540nm, 1550nm, and 1560nm, are employed to create a 120-degree MEMS LiDAR. This LiDAR configuration is optimized for short distances, allowing for simultaneous detection of both left and right lanes. The experimental findings indicate a remarkable 130-meter detection range in long-distance assessments, coupled with a consistent field of view and frame rate performance, with no instances of dropped frames. These favorable characteristics position it as a highly suitable solution for integration in autonomous vehicles.

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This study proposes a projection lens for MR systems. This projection lens features a 50-degree of the lens system, with the entrance pupil at the first surface. The article will discuss the design specifications and image quality of this lens. And this article will discuss optical distortion and the relationship between TV Distortion and then follows optical rules.

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This study employs a novel strategy that combines machine learning and Wiener filter methods to improve the quality of interference images captured by a Michelson interferometer in vibrational environments. We combine advanced filter techniques with carefully constructed machine learning models to enhance interferometric images acquired under the influence of vibration conditions. Compared with traditional image quality improvement methods, our method has the ability to predict the quality of interference images, and can exclude low-quality images in advance, and its average accuracy is as high as 99.81%.

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This paper aims to create a high-intensity infrared light as a light source. Its
purpose is not only for supplemental lighting in high-speed cameras but also for tracking the
movement of objects during motion. Subsequently, the video will be segmented into frames
for baseball analysis. Through this photo analysis, parameters such as ball velocity and pitch
type can be determined for baseball analysis.


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3D printing technology is one most popular manufacturing techniques for prototyping while developing in terahertz (THz) technology. This work provides a new possibility of terahertz passive devices fabricated by masked stereolithography (mSLA) 3D printing technology. By designing and characterizing 3D printed THz lenses, our research showcases the feasibility of producing THz passive components through mSLA and demonstrates their performance and reliability in the real world.

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Photonic crystal lasers employing cholesteric liquid crystals (CLC) offer reduced threshold levels and compact sizes. We researched laser direction using CLC's planar and uniform lying helix (ULH) states. Temperature increases switch the CLC to the planar state, shortening the wavelength, while a perpendicular electric field in ULH state increases the pitch for diverse wavelength tunability in thermally tunable lasers.

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Photonic crystal laser consist of cholesteric liquid crystals mirrors can emit specific circular polarization light according to pitch number of chiral mirrors. By using Berreman numerical method and experiments, we verified that different emission chirality changes depending on pitch numbers. Besides, we discuss the effect of the defect layer thickness on the wavelength. The results not only show the realization of DBR laser with controllable circular polarization ratios in the emitted laser light but provide significant potential development of micro-laser sources with versatile emission properties.

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EM duality can be found with complementary patch and aperture structure in plasmonic Hexagonal lattice where both have the same dispersion relation but different TE/TM characteristics. Stacking the patch and aperture creates a 3D metal complementary structure and opens a bandgap at the K and K' points and forms Pseudospin states with valley degree of freedom. By combining the dual-layered structure and its flipped structure side by side, a boundary is formed. Exciting with pseudo-spin at the boundary allows for the observation of electromagnetic waves being confined to the edge with unidirectional propagation.

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This paper investigated the topological properties of plasmonic photonic topological insulators using the valley Hall theoretical models, along with the numerical simulation method of finite-difference time-domain (FDTD). It proposed a finite-discrete reciprocal lattice Chern number FDTD calculation method to determine the topological characteristics of the structures. The influence of different excitation methods on the Chern number of plasmonic topological insulators is explored.

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In the last two decades, fiber-optic communication and photonic integrated circuits have been popularized rapidly. However, the dimension difference between optical fiber devices and photonic chips makes the design of fiber-to-chip couplers challenging. To solve this problem, several coupling strategies have been proposed, such as inverted taper-based structures, grating couplers and meta-material based couplers. In this paper, we attempted to design a high-efficiency metamaterial-based couplers for a quantum fiber-optic communication system. We theoretically show that the power efficiency of our design reach 85% with the MFD less than 3um.

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Digital holographic microscopy combines digital holography with microscopy,
breaking through the limitations of traditional microscopes. It allows for numerical
reconstruction of the object's wavefront, enabling computer-controlled focusing without the
need for mechanical adjustments. Through analysis, it provides comprehensive information
about the light waves, including amplitude and phase. This allows for observing samples beyond
colored objects and provides more detailed information.


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Scans of different targets are conducted using theoretical ISAR and the FDTD simulated ISAR method. First, the object consisting of a single point and two points were scanned and the results showed that both theoretic ISAR and FDTD-simulated ISAR successfully imaged a single point or two points. However, FDTD resulted in double ghost image. The target was changed to an actual aircraft. The results showed that theoretical ISAR was able to successfully reproduce the contours of the aircraft, while the FDTD-simulated ISAR only provided a rough depiction of the aircraft's shape.

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This study primarily showcases the slot antenna array fed by photonics topological insulator operating at 60GHz by FDTD method. The simulation results show us The excitation efficiency of the array antenna using photonics topological insulator feed is better than that using microstrip-line feed.

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A light field microscope can capture not only the intensity of light rays from objects in a scene but also their direction and angle by using a specialized lens array. Through post-processing, images of objects with different focal plans can be obtained. In this work, a miniaturized light field device for live organism imaging is proposed.


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