Optical Microfluidic Waveguides and Solution Lasers of Colloidal Semiconductor Quantum Wells

• DOI: 10.1002/adma.202007131
• Publication Date: 2021-01-25T11:59:29Z
• Authors: Joudi Maskoun; Negar Gheshlaghi; Furkan Isik; Savas Delikanli; Onur Erdem; Emine Yegan Erdem; Hilmi Volkan Demir
• Keywords: Optofluidics; Microchannel

Abstract The realization of high‐quality lasers in microfluidic devices is crucial for numerous applications, including biological and chemical sensors flow cytometry, the development advanced lab‐on‐chip (LOC) devices. Herein, an ultralow‐threshold single‐mode laser proposed demonstrated using on‐chip cavity. CdSe/CdS@Cd x Zn 1− S core/crown@gradient‐alloyed shell colloidal semiconductor quantum wells (CQWs) dispersed toluene are employed cavity created inside a poly(dimethylsiloxane) (PDMS) device SiO 2 ‐protected Ag mirrors to achieve in‐solution lasing. Lasing from such having CQWs solution as gain medium shown first time with record‐low optical threshold 17.1 µJ cm − ² lasing 68.4 among all solution‐based demonstrations. In addition, air‐stable protected films used designed form highly tunable reflective required attain Fabry–Pérot These realized thresholds emanate together giant cross‐section slow Auger rates. This microfabricated CQW provides compact inexpensive coherent light source microfluidics integrated optics covering visible spectral region.