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Metasurfaces consisting of subwavelength structures have shown unparalleled capability in light field manipulation. However, their functionalities are typically static after fabrication, limiting their practical applications. Though persistent efforts have led to dynamic wavefront control with various materials and mechanisms, most of them work in free space and require specialized materials or bulky configurations for external control.
View Article and Find Full Text PDFA SbS-based reconfigurable diffractive optical neural network (RDONN) for on-chip integration is proposed. The RDONN can be integrated into standard silicon-on-insulator systems, offering a compact, passive, all-optical solution for implementing machine learning functions. The weights of the proposed optical chip are reconfigurable without the need to modify hardware structures or re-fabricate the chip.
View Article and Find Full Text PDFDielectric waveguides are widely recognized as excellent and versatile components for integrated multifunctional photonic chips, thanks to their strong optical confinement capabilities. In this study, we present a novel semi-tapered depressed-cladding waveguide structure, designed and fabricated using femtosecond laser direct writing technology. The optical guiding performance of this semi-tapered waveguide is systematically analyzed by characterizing its loss characteristics.
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View Article and Find Full Text PDFWe present a novel and efficient methodology for obtaining high-gain on-chip few-mode erbium-doped waveguide amplifiers, which exhibit a moderate differential mode gain (DMG). The efficiency of the device is validated by an optimized algorithm that theoretically models the gain performance of the six lowest-order optical modes, namely TE, TM, TE, TM, TE, and TM. Notably, these six signal modes achieve internal net gains exceeding 22 dB within a 5-cm-long waveguide, while maintaining the DMG at a mere 2 dB.
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