High Quality Near-Infrared Single-Mode Lasing from γ-InSe Using a Transferrable Planar Microcavity

The on-chip near-infrared (NIR) lasing devices based on van der Waals (vdW) layered materials are highly desired owing to their widespread applications in optoelectronic communication, computing, and sensing. However, the single-mode NIR lasing devices with superior performance based on vdW layered materials are hard to obtain because of complex and meticulous microcavity structure and the damage to layered materials during preparation. Here, a high-quality NIR single-mode lasing device in γ-phase indium selenide (γ-InSe) is achieved by using a transferrable planar microcavity. The single-mode lasing devices based on distributed Bragg reflectors microcavity and super Tamm structure can be simply prepared with quality factors up to 5710 and 3526, respectively. And angle-resolved spectra show that the lasing device has high directionality with divergence angle <5°. Moreover, the wavelength of lasing device can be tuned ≈30 nm by varying the cavity length via thickness control of γ-InSe layer. These results not only suggest that γ-InSe is a promising material for NIR lasing devices, but also present a simple and effective approach for preparing high-quality lasing devices utilizing other vdW layered materials.