Wavelength‐Tunable Micro/Nanolasers

Abstract

Micro/nanolasers (MNLs) emit coherent light on the micro/nanoscale. Research on the application of MNLs has progressed rapidly in the past two decades because of their great potential for optoelectronics with compact sizes, low cost, and low energy consumption. Wavelength‐tunable MNLs are essential for a variety of fields including optical communications, solid‐state lighting, and on‐chip wavelength‐division multiplexing. Thus far, tremendous progress is achieved toward the development of wavelength‐tunable MNLs based on bandgap tuning and cavity design. Lasing wavelength is substantially defined by material bandgap, tuned by changing the geometry of the cavity structures, and can also, to some extent, be influenced by operational environment. This review is focused on the intrinsic merits of wavelength‐tunable MNLs, and the recent progress is examined. Bandgap engineering, materials synthesis, cavity structure design, wavelength‐tuning principles, and lasing performance are explored and systematically discussed. Finally, the current research status and perspectives on possible future applications are summarized.

Micro‐Nano Structure Functionalized Perovskite Optoelectronics: From Structure Functionalities to Device Applications

“…[ 163,255,256 ] The optical field can form the standing wave in the cavity to realize the effective light management. [ 253,257,258 ] Qin et al. reported a 2D perovskite continue‐wave laser at room temperature ( Figure a).…”

Single-Mode Semiconductor Nanowire Lasers With Coupled Cavities

“…The above-mentioned coupling cavities are mostly FP cavities. In 2019, Zhuge et al ( 2019a ) constructed an nanowire laser based on a FP-WGM-coupled cavity by vertically contacting a CdSSe nanowire and a CdS nanowire. The FP-WGM cavity laser has a threshold value which is about 50% lower than that of the original FP cavity laser.…”

“…To accelerate the practical application of semiconductor nanowire lasers, it is necessary to control and optimize the parameters of nanolasers including wavelength tuning (Li et al, 2013 ; Liu et al, 2013a , b ; Yang et al, 2014 ; Zhuge et al, 2019a , b ), polarization modification (Hurtado et al, 2013 ; Xu et al, 2014 , 2017 ), and mode selection (Xiao et al, 2011a , b ; Li et al, 2012 ; Gao et al, 2013 ; Feng et al, 2014 ; Zhang et al, 2016 ; Yang et al, 2017 ; Bao et al, 2020 ; Yu et al, 2020 ). Among them, the lasing monochromaticity plays an important role as group velocity dispersion between different modes in a multimode laser will result in both temporal pulse broadening and false signaling (Saleh and Teich, 2007 ).…”

Low Thresholds and Tunable Modes in Plasmon‐Assisted Perovskite Microlasers

“…[15][16][17] Plasmonic nano/ microlasers have been achieved in a series of compound semiconductors and low-dimensional semiconductors, such as GaN, ZnO, CdS, and WS 2 . [18][19][20][21][22] But the harsh fabrication condition and the unsatisfied threshold are still in urgent to be improved, which may place hope in exploiting a new material family.…”

“…[15][16][17] Plasmonic nano/ microlasers have been achieved in a series of compound semiconductors and low-dimensional semiconductors, such as GaN, ZnO, CdS, and WS 2 . [18][19][20][21][22] But the harsh fabrication condition and the unsatisfied threshold are still in urgent to be improved, which may place hope in exploiting a new material family.Recently, perovskites have emerged as promising optical gain materials for achieving ultralow-threshold microlasers, owing to their excellent optical properties, such as large absorption coefficient, high photoluminescence (PL) quantum yield, and low non-radiative recombination rate. [23][24][25] By interacting with plasmonic nanostructures, lasing behaviors in perovskites have been reported to show attenuated threshold and high mode quality owing to plasmonic effects.…”