Single‐Mode Lasing from a Single 7 nm Thick Monolayer of Colloidal Quantum Wells in a Monolithic Microcavity. Issue 4 (3rd March 2021)

• Record Type: Journal Article
• Authors: Foroutan‐Barenji, Sina; Erdem, Onur; Delikanli, Savas; Yagci, Huseyin Bilge; Gheshlaghi, Negar; Altintas, Yemliha; Demir, Hilmi Volkan
• Is Part Of: Laser & photonics reviews. Volume 15:Issue 4(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-03-03
• Subjects: colloidal quantum wells -- liquid interface self‐assembly -- monolithic microcavity -- single‐mode lasing -- vertical cavity surface‐emitting laser; Lasers -- Periodicals; Photonics -- Periodicals; Lasers -- Périodiques; Photonique -- Périodiques; 621.36
• DOI: 10.1002/lpor.202000479
• Languages: English
• ISSNs: 1863-8880

Abstract

Abstract: In this work, monolithically‐fabricated vertical cavity surface emitting lasers (VCSELs) of densely‐packed, orientation‐controlled, atomically flat colloidal quantum wells (CQWs) using a self‐assembly method is reported and single‐mode lasing from a record thin colloidal gain medium with a film thickness of 7 nm under femtosecond optical excitation is demonstrated. Specially engineered CQWs are used to demonstrate these hybrid CQW‐VCSELs consisting of only a few layers to a single monolayer of CQWs and are achieved the lasing from these thin gain media by thoroughly modeling and implementing a vertical cavity consisting of distributed Bragg reflectors with an additional dielectric layer for mode tuning. Accurate spectral and spatial alignment of the cavity mode with the CQW films is secured with the help of full electromagnetic computations. While overcoming the long‐pending problem of limited electrical conductivity in thicker colloidal films, such ultrathin colloidal gain media can be helpful to enable fully electrically‐driven colloidal lasers. Abstract : Single‐mode lasing from a record thin self‐assembled monolayer of colloidal quantum wells (CQWs) with a thickness of 7 nm is reported. This results from coupling CQWs to a high quality factor microcavity with accurate spectral and spatial alignment of the cavity mode, which enhances the spontaneous emission due to the Purcell effect, providing means of overcoming Auger recombination.