Whispering-Gallery Mode Lasing in a Floating GaN Microdisk with a Vertical Slit

Zhu, Gangyi; Li, Jiaping; Zhang, Nan; Li, Xin; Dai, Jun; Cui, Qiannan; Song, Qinghai; Xu, Chunxiang; Wang, Yongjin

doi:10.1038/s41598-019-57118-y

Cited by 29 publications

(14 citation statements)

References 25 publications

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“…Previous works on microlasers for on-chip applications mainly focused on directing the in-plane emission of WGM microlasers in a specific direction by introducing boundary deformations 11,[15][16][17][18][19] , diffraction gratings [20][21][22] , or scatterers [23][24][25][26] . Nevertheless, omnidirectional laser emission into 4π steradians has neither been attempted nor demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Laser particles with omnidirectional emission for cell tracking

et al. 2021

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The ability to track individual cells in space over time is crucial to analyzing heterogeneous cell populations. Recently, microlaser particles have emerged as unique optical probes for massively multiplexed single-cell tagging. However, the microlaser far-field emission is inherently direction-dependent, which causes strong intensity fluctuations when the orientation of the particle varies randomly inside cells. Here, we demonstrate a general solution based on the incorporation of nanoscale light scatterers into microlasers. Two schemes are developed by introducing either boundary defects or a scattering layer into microdisk lasers. The resulting laser output is omnidirectional, with the minimum-to-maximum ratio of the angle-dependent intensity improving from 0.007 (−24 dB) to > 0.23 (−6 dB). After transfer into live cells in vitro, the omnidirectional laser particles within moving cells could be tracked continuously with high signal-to-noise ratios for 2 h, while conventional microlasers exhibited frequent signal loss causing tracking failure.

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Section: Introductionmentioning

confidence: 99%

Laser particles with omnidirectional emission for cell tracking

et al. 2021

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“…[ 48 ] Thus, for practical applications, it has been proposed to apply additional waveguide structures to couple light out [ 144 ] or create defects in the microcavities such as slits to change the optical path. [ 145 ]…”

Section: Realization Of Lasersmentioning

confidence: 99%

“…[48] Thus, for practical applications, it has been proposed to apply additional waveguide structures to couple light out [144] or create defects in the microcavities such as slits to change the optical path. [145] Figure 9. a) CsPbBr 3 NW emission spectra with increasing pump fluence around the lasing threshold.…”

Section: Whispering Gallery Mode Lasers (Wgm)mentioning

confidence: 99%

Metal Halide Perovskites for Laser Applications

Lei

Dong

Gündoğdu

et al. 2021

Adv Funct Materials

246

164

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Metal halide perovskites have drawn tremendous attention in optoelectronic applications owing to the rapid development in photovoltaic and light‐emitting diode devices. More recently, these materials are demonstrated as excellent gain media for laser applications due to their large absorption coefficient, low defect density, high charge carrier mobility, long carrier diffusion length, high photoluminescence quantum yield, and low Auger recombination rate. Despite the great progress in laser applications, the development of perovskite lasers is still in its infancy and the realization of electrically pumped lasers has not yet been demonstrated. To accelerate the development of perovskite‐based lasers, it is important to understand the fundamental photophysical characteristics of perovskite gain materials. Here, the structure and gain behavior in various perovskite materials are discussed. Then, the effects of charge carrier dynamics and electron–phonon interaction on population inversion in different types of perovskite materials are analyzed. Further, recent advances in perovskite‐based lasers are also highlighted. Finally, a perspective on perovskite material design is presented and the remaining challenges of perovskite lasers are discussed.

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“…It is also worth mentioning that considering the very small sizes of the NW cross section in comparison to the lasing wavelength, the irregular polygon shape of the cross section, and tapering of the NWs, the whispering gallery mode (WGM) is very unlikely to be supported in the “RL system”. Moreover, the near-field emission profiles reported in our previous work show that the sizes of the modes are much bigger than the size of NW and the emission does not originate from the side of the NW, eliminating any possibility of WGMs. In other words, the “RL system” can only support random lasing cavities.…”

Section: Resultsmentioning

confidence: 67%

Characteristics and Thermal Control of Random and Fabry–Pérot Lasing in Nanowire Arrays

et al. 2022

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Nanolasers have attracted intense interest in the past decade because they are more compact, can be operated at higher modulation speed, and are more power-efficient than classical lasers. Thanks to these capabilities, nanolasers are now emerging for a variety of practical applications. This work presents hybrid nanolasers supporting both Fabry–Pérot and random lasing modes at room and cryogenic temperatures. These lasing modes are shown to exhibit differences in their lasing properties, such as wavelength, polarization, and coherency. New practical and broadly applicable methods are presented to distinguish these modes, including polarization-resolved measurements, near-field imaging, and photoluminescence spectroscopy measurements. Importantly, this paper demonstrates tuning between different lasing types in nanolasers, i.e., between Fabry–Pérot and random lasing. This allows the tuning of several lasing properties beyond only wavelength tuning. Thermal tuning is used here, where the Fabry–Pérot lasing modes are dominant at cryogenic temperatures, and at room temperature, random lasing becomes dominant. This work presents the first NW dual-cavity nanolaser and the first demonstration of thermal tuning between laser cavity types. As such, it provides the foundation for hybrid nanolasers, where various lasing properties can be tuned.

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Whispering-Gallery Mode Lasing in a Floating GaN Microdisk with a Vertical Slit

Cited by 29 publications

References 25 publications

Laser particles with omnidirectional emission for cell tracking

Laser particles with omnidirectional emission for cell tracking

Metal Halide Perovskites for Laser Applications

Characteristics and Thermal Control of Random and Fabry–Pérot Lasing in Nanowire Arrays

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