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dc.contributor.authorForoutan-Barenji, Sina
dc.contributor.authorErdem, Onur
dc.contributor.authorGheshlaghi, Negar
dc.contributor.authorAltıntaş, Yemliha
dc.contributor.authorDemir, Hilmi Volkan
dc.date.accessioned2021-03-05T09:38:53Z
dc.date.available2021-03-05T09:38:53Z
dc.date.issued2020
dc.identifier.issn1613-6810
dc.identifier.urihttp://hdl.handle.net/11693/75831
dc.description.abstractThis 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.en_US
dc.language.isoEnglishen_US
dc.source.titleSmallen_US
dc.relation.isversionofhttps://dx.doi.org/10.1002/smll.202004304en_US
dc.subjectColloidal quantum wellsen_US
dc.subjectLiquid–air interface self‐assemblyen_US
dc.subjectOptical gainen_US
dc.subjectOptical mode confinementen_US
dc.subjectUltra‐thin waveguidesen_US
dc.titleOptical gain in ultrathin self‐assembled bi‐layers of colloidal quantum wells enabled by the mode confinement in their high‐index dielectric waveguidesen_US
dc.typeArticleen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.citation.spage2004304-1en_US
dc.citation.epage2004304-10en_US
dc.citation.volumeNumber16en_US
dc.citation.issueNumber45en_US
dc.identifier.doi10.1002/smll.202004304en_US
dc.publisherWiley-VCH Verlagen_US
dc.contributor.bilkentauthorForoutan-Barenji, Sina
dc.contributor.bilkentauthorErdem, Onur
dc.contributor.bilkentauthorGheshlaghi, Negar
dc.contributor.bilkentauthorAltıntaş, Yemliha
dc.contributor.bilkentauthorDemir, Hilmi Volkan
dc.embargo.release2021-11-12
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112Xen_US


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