Broadband Nonlinear Optical Response of InSe Nanosheets for the Pulse Generation From 1 to 2 μm

Han Pan; Lihua Cao; Hongwei Chu; Yunzheng Wang; Shengzhi Zhao; Ying Li; Na Qi; Zhenlu Sun; Xiantao Jiang; Rui Wang; Han Zhang; Dechun Li

doi:10.1021/acsami.9b18632

Broadband Nonlinear Optical Response of InSe Nanosheets for the Pulse Generation From 1 to 2 μm

ACS Appl Mater Interfaces. 2019 Dec 26;11(51):48281-48289. doi: 10.1021/acsami.9b18632. Epub 2019 Dec 13.

Authors

Han Pan¹, Lihua Cao¹, Hongwei Chu¹, Yunzheng Wang², Shengzhi Zhao¹, Ying Li³, Na Qi³, Zhenlu Sun¹, Xiantao Jiang², Rui Wang⁴, Han Zhang², Dechun Li¹

Affiliations

¹ School of Information Science and Engineering , Shandong University , Qingdao 266237 , China.
² Collaborative Innovation Center for Optoelectronic Science & Technology, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, College of Physics and Optoelectronic Engineering , Shenzhen University , Shenzhen 518060 , China.
³ Key Laboratory of Colloid and Interface Chemistry of State Education Ministry, School of Chemistry and Chemical Engineering , Shandong University , Jinan 250100 , China.
⁴ Department of Electronic Engineering , Xiamen University , Xiamen 361005 , China.

PMID: 31834767
DOI: 10.1021/acsami.9b18632

Abstract

Few-layered InSe nanosheets were fabricated by the simple liquid-phase exfoliation method. The morphology and crystal structure features of InSe nanosheet sample were characterized comprehensively. The photoluminescence (PL) spectrum indicated that the liquid-phase exfoliated InSe nanosheets contained variously layered nanoflakes, where eight layers nanosheets dominate. In addition, the first-principle simulation was carried out to describe the electron density of states (DOS) and the electronic band structures. Moreover, the few-layered InSe nanosheets performed excellent nonlinear absorption properties in a broad spectral band. As an application, the stable passively Q-switched (PQS) lasers with few-layered InSe nanosheets saturable absorbers (SAs) were realized with the operating wavelengths at 1.06, 1.34, and 1.91 μm. The shortest pulse durations were 599, 520, and 210 ns, respectively. Our results confirmed that the few-layered InSe nanosheets could be an excellent candidate for pulsed lasers in wide spectral bands.

Keywords: Q-switching lasers; Z-scan technique; few-layered InSe nanosheets; liquid-phase exfoliation; nonlinear absorption properties; saturable absorber.