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Precise photoelectrochemical tuning of semiconductor microdisk lasers

Advanced Photonics 2023年第5期5卷 68-76页

作者： Debarghya Sarkar Paul HDannenberg Nicola Martino Kwon-Hyeon Kim Yue Wu Seok-Hyun Yun Harvard Medical School BostonMassachusettsUnited States Massachusetts General Hospital Wellman Center for PhotomedicineBostonMassachusettsUnited States Massachusetts Institute of Technology Harvard-MIT Health Sciences and TechnologyCambridgeMassachusettsUnited States

Micro-and nanodisk lasers have emerged as promising optical sources and probes for on-chip and free-space ***,the randomness in disk diameter introduced by standard nanofabrication makes it challenging to obtain deterministic *** address this,we developed a photoelectrochemical(PEC)etching-based technique that enables us to precisely tune the lasing wavelength with subnanometer *** examined the PEC mechanism and compound semiconductor etching rate in diluted sulfuric acid *** this technique,we produced microlasers on a chip and isolated particles with distinct lasing *** precisely tuned disk lasers were then used to tag cells in *** results demonstrate that this scalable technique can be used to produce groups of lasers with precise emission wavelengths for various nanophotonic and biomedical applications.

关键词： microdisk lasers semiconductor precision lasing photoelectrochemical etching laser particle nanophotonics

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Erbium-ytterbium co-doped lithium niobate single-mode microdisk laser with an ultralow threshold of 1μW

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Chinese Optics Letters 2024年第4期22卷 48-52页

作者：李明慧高仁宏黎春桃管江林张海粟林锦添赵光辉乔迁汪旻乔玲玲邓莉程亚 Chinese Academy of Sciences(CAS)Shanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China XXL—The Extreme Optoelectromechanics Laboratory School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China School of Physical Science and Technology Shanghai Tech UniversityShanghai 200031China Shanghai Research Center for Quantum Sciences Shanghai 201315China Hefei National Laboratory Hefei 230088China

We demonstrate single-mode microdisk lasers in the telecom band with ultralow thresholds on erbium-ytterbium co-doped thin-film lithium niobate(TFLN).The active microdisk was fabricated with high-Q factors by photolithography-assisted chemomechanical *** to the erbium-ytterbium co-doping providing high optical gain,the ultralow loss nanostructuring,and the excitation of high-Q coherent polygon modes,which suppresses multimode lasing and allows high spatial mode overlap between pump and lasing modes,single-mode laser emission operating at 1530 nm wavelength was observed with an ultralow threshold,under a 980-nm-band optical *** threshold was measured as low as 1μW,which is one order of magnitude smaller than the best results previously reported in single-mode active TFLN *** conversion efficiency reaches 4.06×10^(-3),which is also the highest value reported in single-mode active TFLN microlasers.

关键词： lithium niobate microcavities microdisk lasers

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