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Opto-Electronic Science 第2卷 第3期

Author Affiliations
Abstract
1 Integrated Photonics and Applications Centre, School of Engineering, RMIT University, Melbourne VIC 3001, Australia
2 School of Electrical and Electronic Engineering, The University of Adelaide, Adelaide SA 5005, Australia
3 Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide SA 5005, Australia
In this contribution, we simulate, design, and experimentally demonstrate an integrated optical isolator based on spatiotemporal modulation in the thin-film lithium niobate on an insulator waveguide platform. We used two cascaded travelling wave phase modulators for spatiotemporal modulation and a racetrack resonator as a wavelength filter to suppress the sidebands of the reverse propagating light. This enabled us to achieve an isolation of 27 dB. The demonstrated suppression of the reverse propagating light makes such isolators suitable for the integration with III-V laser diodes and Erbium doped gain sections in the thin-film lithium niobate on the insulator waveguide platform.
Isolator lithium niobate modulator 
Opto-Electronic Science
2023, 2(3): 220022
Hui Gao 1,2,*†Xuhao Fan 1†Yuxi Wang 1†Yuncheng Liu 1[ ... ]Wei Xiong 1,2,***
Author Affiliations
Abstract
1 Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
2 Optics Valley Laboratory, Wuhan 430074, China
Multispectral and polarized focusing and imaging are key functions that are vitally important for a broad range of optical applications. Conventional techniques generally require multiple shots to unveil desired optical information and are implemented via bulky multi-pass systems or mechanically moving parts that are difficult to integrate into compact and integrated optical systems. Here, a design of ultra-compact transversely dispersive metalens capable of both spectrum and polarization ellipticity recognition and reconstruction in just a single shot is demonstrated with both coherent and incoherent light. Our design is well suited for integrated and high-speed optical information analysis and can significantly reduce the size and weight of conventional devices while simplifying the process of collecting optical information, thereby promising for various applications, including machine vision, minimized spectrometers, material characterization, remote sensing, and other areas which require comprehensive optical analysis.
metalens multispectral imaging polarized imaging spectra and polarization reconstruction 
Opto-Electronic Science
2023, 2(3): 220026