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China's Top 10 Optical Breakthroughs Special Column|3 Article(s)
China's Top 10 Optical Breakthroughs: Research Progress of Photonic Skyrmion
Min Lin, Luping Du, and Xiaocong Yuan
Recently, photonic skyrmion as a topological nontrivial structure has attracted widely research attention. Due to their ultracompact size, high stability, and diversity of topologies, photonic skyrmions have potential value in applications of high-resolution polarization imaging, high-density optical information storage, and high-precision displacement sensing. In this paper, the fundamental mechanisms and the excitation and detection methods of photonic skyrmion are introduced, and the domestic and foreign state-of-the-art studies on the photonic skyrmion in different optical systems are summarized. In view of the deep-subwavelength features of the photonic skyrmion, the recent research progress of the applications of photonic skyrmions is also reviewed, and its future development is analyzed and prospected. Recently, photonic skyrmion as a topological nontrivial structure has attracted widely research attention. Due to their ultracompact size, high stability, and diversity of topologies, photonic skyrmions have potential value in applications of high-resolution polarization imaging, high-density optical information storage, and high-precision displacement sensing. In this paper, the fundamental mechanisms and the excitation and detection methods of photonic skyrmion are introduced, and the domestic and foreign state-of-the-art studies on the photonic skyrmion in different optical systems are summarized. In view of the deep-subwavelength features of the photonic skyrmion, the recent research progress of the applications of photonic skyrmions is also reviewed, and its future development is analyzed and prospected.
Laser & Optoelectronics Progress
- Publication Date: Dec. 25, 2023
- Vol. 60, Issue 24, 2400001 (2023)
China's Top 10 Optical Breakthroughs: Sub-50-ns Ultrafast Upconversion Luminescence of Rare-Earth-Doped Nanoparticle
Bowen Kang, Huan Chen, Zhenglong Zhang, and Hairong Zheng
Rare-earth-doped upconversion nanoparticles have attracted considerable attention because of their stable, narrowband, and multi-color luminescence, which features less crosstalk, photo-blinking, and photo-bleaching compared with quantum dots and organic dyes. However, rare-earth ions exhibit long luminescence decay times (ranging from microseconds to milliseconds), low quantum efficiency, weak luminescence intensity, and nondirectional far-field emission, restricting their application in time-dependent nanophotonic devices. Optical fields and electron excitations are coupled in plasmonic nanocavities, which is beneficial for significantly shortening the luminescence decay time, improving the quantum efficiency, enhancing the upconversion luminosity efficiency, and effectively controlling the emission direction. The paper reviews recent progress in nanocavity modulation of rare-earth ion luminescence, with a focus on the work of nanocavity modulation of rare-earth ions to achieve sub-50-ns ultrafast upconversion luminescence, and prospects for its applications in single-photon sources, quantum communication devices, and nanolasers. Rare-earth-doped upconversion nanoparticles have attracted considerable attention because of their stable, narrowband, and multi-color luminescence, which features less crosstalk, photo-blinking, and photo-bleaching compared with quantum dots and organic dyes. However, rare-earth ions exhibit long luminescence decay times (ranging from microseconds to milliseconds), low quantum efficiency, weak luminescence intensity, and nondirectional far-field emission, restricting their application in time-dependent nanophotonic devices. Optical fields and electron excitations are coupled in plasmonic nanocavities, which is beneficial for significantly shortening the luminescence decay time, improving the quantum efficiency, enhancing the upconversion luminosity efficiency, and effectively controlling the emission direction. The paper reviews recent progress in nanocavity modulation of rare-earth ion luminescence, with a focus on the work of nanocavity modulation of rare-earth ions to achieve sub-50-ns ultrafast upconversion luminescence, and prospects for its applications in single-photon sources, quantum communication devices, and nanolasers.
Laser & Optoelectronics Progress
- Publication Date: Dec. 10, 2023
- Vol. 60, Issue 23, 2300002 (2023)
China's Top 10 Optical Breakthroughs: Electron-Phonon Coupling Effect and Laser Wavelength Extension
Fei Liang, Cheng He, Yanfeng Chen, Haohai Yu, and Huaijin Zhang
Electron-phonon coupling effect is an important physical phenomenon for laser wavelength extension in solid-state laser materials. This review summarized the history of tunable solid-state lasers, namely, color-center, transition-metal, and rare-earth lasers, focusing on the spectral homogeneous broadening induced by the electron-phonon coupling effect. Recently, based on the multiphonon-coupling theory, an ultrabroadband laser emission far beyond the fluorescence spectrum was reported,thus greatly extending the available laser wavelengths. Moreover, various self-frequency doubling lasers were developed by combining the multiphonon-coupling and nonlinear-optical-conversion into one single crystal, thereby creating some low-cost and compact visible laser modules, covering the cyan-green-yellow-orange-red spectral range. These newly developed laser sources can meet the urgent demand of laser-based surgery and laser display applications, which can push and promote the rapid development of the all-solid-state laser technology. Electron-phonon coupling effect is an important physical phenomenon for laser wavelength extension in solid-state laser materials. This review summarized the history of tunable solid-state lasers, namely, color-center, transition-metal, and rare-earth lasers, focusing on the spectral homogeneous broadening induced by the electron-phonon coupling effect. Recently, based on the multiphonon-coupling theory, an ultrabroadband laser emission far beyond the fluorescence spectrum was reported,thus greatly extending the available laser wavelengths. Moreover, various self-frequency doubling lasers were developed by combining the multiphonon-coupling and nonlinear-optical-conversion into one single crystal, thereby creating some low-cost and compact visible laser modules, covering the cyan-green-yellow-orange-red spectral range. These newly developed laser sources can meet the urgent demand of laser-based surgery and laser display applications, which can push and promote the rapid development of the all-solid-state laser technology.
Laser & Optoelectronics Progress
- Publication Date: Dec. 10, 2023
- Vol. 60, Issue 23, 2300001 (2023)
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