Session Index

To realize a stable and widely tunable laser for applications in optical communication and sensing systems, we design and optimize a wavelength tunable laser forming with a gain chip and a silicon-photonics dual-ring resonator as an external cavity. The dual ring resonators have different free spectral ranges to employ the Vernier effect to enlarge the wavelength tuning ranges. The simulation indicates that the dual-ring resonator-based tunable laser achieves a wavelength tuning range of 77.67 nm, with a minimum side-mode suppression ratio (SMSR) exceeding 35 dB and an average SMSR of 43.8 dB.

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This work employed nanotransfer printing (nTP), a simple method for fabricating plasmonic color filters. We employed e-beam deposition and nTP to transfer the metal array. Furthermore, by undergoing two rounds of nTP, we successfully accomplished the fabrication of a 3D metasurface with a straightforward and efficient approach. The optical properties of the fabricated plasmonic color filters were evaluated through simulation and experiment. We believe that nTP is a promising technique for metallic patterning, offering a viable approach for the fabrication of plasmonic metasurfaces.

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The electron microscopy techniques for nanofabrication and study of nanomaterials for photonics application are presented. New Zeiss solutions allow not only to produce of periodic nanostructures in different materials, but also to visualize the structure with high resolution during the process of nanofabrication. The benefits of Gemini electronic optics for high quality imaging and Ion-sculptor FIB column for sample preparation and nanostructuring are demonstrated.

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We explore a solvent engineering approach to enhance the quality and optical performance of quasi-2D perovskite thin films. By optimizing the ratio of γ-butyrolactone (GBL) and dimethyl sulfoxide (DMSO) in the solvent mixture and carefully controlling the timing of antisolvent dripping, we successfully synthesized quasi-2D perovskite thin films based on BA2PbI4 films with a surface coverage exceeding 98%. This method resulted in an increased absorption rate and improved photoluminescence emission. These findings can potentially be applied to enhance the optoelectronic properties of other 2D perovskite materials, making them promising candidates for use in light-emitting devices and energy-harvesting components.

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This study presents the synthesis and characterization of previously unexplored In6Se7 crystals, a III-VI class compound semiconductor with potential optoelectronic applications. In6Se7 crystals were grown using CVT method with ICl3 as transport agent. Structural analysis and the effects of P content on electrical properties were investigated, providing valuable insights into this field. EDS mapping and TEM confirm the high-quality of In6Se7:P crystals, while XRD and Raman reveal monoclinic crystal structure. In6Se7:P exhibit n-type behavior likely due to P-Se bonds. The work function of P-doped In6Se7 was measured, and P dopants are considered suitable donor-type impurities for future In6Se7 device applications.

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In recent years, the concept of using metasurfaces integrated liquid crystals to achieve active control of hue has become increasingly important. However, this method lacked the ability to adjust brightness, limiting its practical applicability. In this study, we aim to design three metamaterial perfect absorbers as metasurfaces, combined with a liquid crystal module. These metamaterial perfect absorbers will correspond to one of the primary colors (red, blue, and green) and black, for two different polarization directions. By utilizing the liquid crystal module to rotate the incident light's polarization direction, we can adjust both the displayed hue and brightness.

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In this study, we propose a novel design for large-area photoconductive emitters using plasmonic contact electrodes. Our optimized design incorporates superlattices made of InGaAs and InAlAs materials, enabling efficient terahertz (THz) generation and detection. By enhancing carrier separation and acceleration within the device, we achieve significantly higher optical-to-terahertz conversion efficiencies compared to conventional designs. Furthermore, we comprehensively analyze the impact of electrode parameters, including individual pairs, emitter density, and exposed semiconductor area, on the emission efficiency. Our findings pave the way for advancements in THz technology, offering promising prospects for various applications in terahertz generation and detection systems.

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We investigate the bound states in the continuum (BICs) in dielectric metasurfaces consisting of square patches deposited on a dielectric substrate. Symmetric-protected BICs occur at the Brillouin zone center, which are associated with extremely large quality factors and small linewidths. In particular, the BICs are identified as toroidal dipole (TD) modes characterized by the electric or magnetic fields bend into a torus, with the magnetic or electric circling around the surface. Both the electric or magnetic TDs are gathered in the unit cell to form the multiple TD modes.

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