Single-mode nanolasers based on FP-WGM hybrid cavity coupling

Salman Ullah; Minghua Zhuge; Liang Zhang; Xiang Fu; Yaoguang Ma; Qing Yang

doi:10.1088/1361-6528/ad28d4

Single-mode nanolasers based on FP-WGM hybrid cavity coupling

Nanotechnology. 2024 Feb 29;35(20). doi: 10.1088/1361-6528/ad28d4.

Authors

Salman Ullah^{1

2}, Minghua Zhuge³, Liang Zhang⁴, Xiang Fu⁴, Yaoguang Ma¹, Qing Yang^{1

2}

Affiliations

¹ State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.
² ZJU-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou 311215, People's Republic of China.
³ College of Integrated Circuits and Optoelectronic Chips, Shenzhen Technology University, Shenzhen 518118, People's Republic of China.
⁴ Research Center for Novel Computational Sensing and Intelligent Processing, Zhejiang Lab, Hangzhou 311100, People's Republic of China.

PMID: 38350123
DOI: 10.1088/1361-6528/ad28d4

Abstract

As an idealized light source, semiconductor nanowire (NW) lasers have been extensively studied due to its potential applications in many fields such as optoelectronics, nanophononics, optical communication, signal processing, and displays. In this letter, we proposed a novel approach to realize a single-mode nanolaser by forming an Fabry-Perot whispering gallery mode (FP-WGM) hybrid nanocavity between two cross-contact CdS NWs, i.e.xandy-NW. In our method,x-NW supports the regular FP oscillation in the axis direction while the cross section ofy-NW provides a ultrasmall WGM nanocavity with a higherQ-factor and mode election which confirms the specific single mode can be excited. Experimentally, single-mode lasing emission centered at 517 nm was obtained with full width at half maximum of 0.08 nm and lasing threshold of ∼50 kW cm^-2. The suggested designing skills projected a general strategy for lasing mode regulation and single-mode realization. The single-mode low-threshold lasing strategy in coupled NWs may open a new avenue for practical applications of NW lasers and further trigger other photonic devices at a visible range.

Keywords: CdS; Q-factor; coupling; free spectral range; nanolaser; nanowires.