Hemispherical Cesium Lead Bromide Perovskite Single-Mode Microlasers with High-Quality Factors and Strong Purcell Enhancement

Abstract

We realized a single-mode laser with an ultra-high quality factor in individual cesium lead bromide (CsPbBr 3 ) perovskite micro-hemispheres fabricated by chemical vapor deposition. A series of lasing property analysis based on cavity size was reported under this material system. Due to good optical confinement capability of the whispering gallery resonant cavity and high optical gain of CsPbBr 3 perovskite micro-hemispheres, single-mode lasing behavior was achieved with an ultra-high quality factor as large as 11,460 at room temperature. To study in detail the physical effects between lasing threshold and cavity, a set of cavity size dependence photoluminescence analyses were performed. We found that the lasing threshold increases while the cavity size decreases. Time-resolved PL analysis was conducted to confirm the relation between cavity size and lasing threshold. The larger cavity stands for longer PL lifetime and indicates easier-to-achieve carrier population inversion. Strong Purcell enhancement could be further investigated by the spontaneous emission coupling factor β and internal quantum efficiency as a function of cavity size. A high β-factor of 0.37 could be obtained from a 2.2 μm diameter hemisphere microcavity and a high Purcell factor of 14 in a 1.9 μm diameter hemisphere microcavity showing strong Purcell enhancement effect in our system.

Highly Stable Lasing from Solution‐Epitaxially Grown Formamidinium‐Lead‐Bromide Micro‐Resonators

“…Although the high potential of MHPs for lasing has been proven in respect to stability, [12][13][14] low lasing threshold, [7,15,16] high coherence and high-quality factor in the literature, [17][18][19] presenting various resonator geometries, [15,[17][18][19][20][21][22][23][24][25][26][27][28] only a few reports exist about lasing from epitaxial MHPs. All the epitaxial lasers have been prepared by the CVD method, that is, by depositing either all-inorganic CsPbX 3 or MAPbBr 3 on substrates with a different crystal structure as the perovskites, such as mica or GaN.…”

Constraint Mechanism of Power Device Design Based on Perovskite Quantum Dots Pumped by an Electron Beam

“…In current academia, regarding the enhancement of random lasing efficiency and the quality factor of CsPbBr 3 pumped by optics, the main methods include lowering the wavelength of pumping laser [ 20 , 21 , 22 , 23 ], shortening the pumping time gap [ 24 , 25 , 26 , 27 ], manufacturing a complex noncrystalline structure [ 28 , 29 , 30 , 31 ] and so on. Among them, the most typical method is enhancing the surface roughness of CsPbBr 3 films [ 32 , 33 , 34 , 35 , 36 ], which can cheaply increase the probability of CsPbBr 3 nanocrystalline pumped by multiple photons at the same time. However, whether it is to compress the pump time slot or to increase the surface roughness, it is to increase the lasing probability by increasing the pump energy density of nanocrystals, which will undoubtedly lead to an enhancement in the unnecessary local thermal density and thermal effect interference.…”

Single-Mode Lasing in Plasmonic-Enhanced Woven Microfibers for Multifunctional Sensing

“…With their high quality (Q) factors and low mode volumes, whispering gallery mode (WGM) resonators have received significant research attention. − WGMs are supported by a variety of cavity geometries, in which the photons are confined efficiently to a microcavity with smooth surfaces through continuous total internal reflection, with geometries that include microspheres, − microdisks, , microrings, − and microfibers. − To date, a variety of fabrication schemes for WGM cavity construction have been demonstrated, including electron beam lithography, , the inkjet-printing method, , and the electrospinning method . These successful approaches have opened the door to fabrication of WGM resonators for compact display and sensing applications.…”