Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/148386
Title: Optical gain in ultrathin self-assembled bi-layers of colloidal quantum wells enabled by the mode confinement in their high-index dielectric waveguides
Authors: Foroutan-Barenji, Sina
Erdem, Onur
Gheshlaghi, Negar
Altintas, Yemliha
Demir, Hilmi Volkan
Keywords: Science::Physics
Issue Date: 2020
Source: Foroutan-Barenji, S., Erdem, O., Gheshlaghi, N., Altintas, Y. & Demir, H. V. (2020). Optical gain in ultrathin self-assembled bi-layers of colloidal quantum wells enabled by the mode confinement in their high-index dielectric waveguides. Small, 16(45), e2004304-. https://dx.doi.org/10.1002/smll.202004304
Journal: Small
Abstract: This study demonstrates an ultra-thin colloidal gain medium consisting of bi-layers of colloidal quantum wells (CQWs) with a total film thickness of 14 nm integrated with high-index dielectrics. To achieve optical gain from such an ultra-thin nanocrystal film, hybrid waveguide structures partly composed of self-assembled layers of CQWs and partly high-index dielectric material are developed and shown: in asymmetric waveguide architecture employing one thin film of dielectric underneath CQWs and in the case of quasi-symmetric waveguide with a pair of dielectric films sandwiching CQWs. Numerical modeling indicates that the modal confinement factor of ultra-thin CQW films is enhanced in the presence of the adjacent dielectric layers significantly. The active slabs of these CQW monolayers in the proposed waveguide structure are constructed with great care to obtain near-unity surface coverage, which increases the density of active particles, and to reduce the surface roughness to sub-nm scale, which decreases the scattering losses. The excitation and propagation of amplified spontaneous emission (ASE) along these active waveguides are experimentally demonstrated and numerically analyzed. The findings of this work offer possibilities for the realization of ultra-thin electrically driven colloidal laser devices, providing critical advantages including single-mode lasing and high electrical conduction.
URI: https://hdl.handle.net/10356/148386
ISSN: 1613-6829
DOI: 10.1002/smll.202004304
Rights: This is the peer reviewed version of the following article: Foroutan-Barenji, S., Erdem, O., Gheshlaghi, N., Altintas, Y. & Demir, H. V. (2020). Optical gain in ultrathin self-assembled bi-layers of colloidal quantum wells enabled by the mode confinement in their high-index dielectric waveguides. Small, 16(45), e2004304-. https://dx.doi.org/10.1002/smll.202004304, which has been published in final form at https://doi.org/10.1002/smll.202004304. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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