title: Room-temperature near-infrared high-Q perovskite whispering-gallery planar nanolasers.
abstract: Near-infrared (NIR) solid-state micro/nanolasers are important building blocks for true integration of optoelectronic circuitry. Although significant progress has been made in III-V nanowire lasers with achieving NIR lasing at room temperature, challenges remain including low quantum efficiencies and high Auger losses. Importantly, the obstacles toward integrating one-dimensional nanowires on the planar ubiquitous Si platform need to be effectively tackled. Here we demonstrate a new family of planar room-temperature NIR nanolasers based on organic-inorganic perovskite CH3NH3PbI(3-a)X(a) (X = I, Br, Cl) nanoplatelets. Their large exciton binding energies, long diffusion lengths, and naturally formed high-quality planar whispering-gallery mode cavities ensure adequate gain and efficient optical feedback for low-threshold optically pumped in-plane lasing. We show that these remarkable wavelength tunable whispering-gallery nanolasers can be easily integrated onto conductive platforms (Si, Au, indium tin oxide, and so forth). Our findings open up a new class of wavelength tunable planar nanomaterials potentially suitable for on-chip integration.
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371.
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhang
authors.forename: Son Tung
authors.initials: ST
authors.lastname: Ha
authors.forename: Xinfeng
authors.initials: X
authors.lastname: Liu
authors.forename: Tze Chien
authors.initials: TC
authors.lastname: Sum
authors.forename: Qihua
authors.initials: Q
authors.lastname: Xiong
keywords: Organic−inorganic perovskites; nanoplatelets; near-infrared lasers; on-chip integration; wavelength tunable; whispering gallery mode lasing