Tailoring Whispering Gallery Lasing and Random Lasing in A Compound Cavity.

Zhiyang Xu,Junhua Tong,Jinxiang Deng,Xiaoyu Shi,Tianrui Zhai

doi:10.3390/polym12030656

Zhiyang Xu, Junhua Tong + Show 3 more

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https://doi.org/10.3390/polym12030656

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Journal: Polymers	Publication Date: Mar 13, 2020
Citations: 21	License type: CC BY 4.0

Affiliation: Beijing University of Technology

Abstract

A compound cavity was proposed to achieve both whispering gallery mode (WGM) lasing and random lasing. The WGM-random compound cavity consisted of a random structure with an annular boundary, which was fabricated by a method combining both inkjet printing and metal-assisted chemical etching methods. An ultrathin polymer membrane was attached to the WGM-random compound cavity, forming a polymer laser device. A transformation from WGM lasing to random lasing was observed under optical pumping conditions. The laser performance could be easily tailored by changing the parameter of the WGM-random compound cavity. These results provide a new avenue for the design of integrated light sources for sensing applications.

Highlights

Microcavity lasers have attracted significant attention due to their small size, low threshold, and broad universal applications, e.g., displays, imaging, sensing, and on-chip optical communication [1,2,3,4].A large variety of microcavities have been designed to fabricate microscale lasers, e.g., Fabry-Perot, distributed feedback (DFB), and random and whispering gallery mode (WGM) lasers [5,6,7,8,9]
The WGM lasing was achieved via total internal reflection, which resulted in low threshold and narrow linewidth lasers [13,14,15]
By combining the inkjet printing and metal-assisted chemical etching (MACE) methods, a WGM-random compound cavity was fabricated to tailor the property of the WGM lasing and random lasing simultaneously

Summary

Introduction

Microcavity lasers have attracted significant attention due to their small size, low threshold, and broad universal applications, e.g., displays, imaging, sensing, and on-chip optical communication [1,2,3,4].A large variety of microcavities have been designed to fabricate microscale lasers, e.g., Fabry-Perot, distributed feedback (DFB), and random and whispering gallery mode (WGM) lasers [5,6,7,8,9]. Microcavity lasers have attracted significant attention due to their small size, low threshold, and broad universal applications, e.g., displays, imaging, sensing, and on-chip optical communication [1,2,3,4]. A particular advantage of the random laser was that they can be produced on small size, cavity-less, and low spatial coherence [10,11,12]. The WGM lasing was achieved via total internal reflection, which resulted in low threshold and narrow linewidth lasers [13,14,15]. Different kinds of laser were expected to be integrated in a compound cavity to explore the miniaturization and interactions of microcavity lasers. Liu et al reported a stable hybrid WGM/random lasing, which was achieved from a single microsized SiO2 sphere with all-inorganic perovskite CsPbBr3 -SiO2 quantum dots (QDs) embedded [19]. It remains a challenge to tailor both WGM and random lasers in one single device

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