Observation of optical gain from aqueous quantum well heterostructures in water

buir.contributor.orcidDelikanlı, Savaş|0000-0002-0613-8014en_US
buir.contributor.orcidIşık, Furkan|0000-0001-5881-5438en_US
buir.contributor.orcidErdem, Onur|0000-0003-2212-965Xen_US
buir.contributor.orcidShabani, Farzan|0000-0003-2174-5960en_US
buir.contributor.orcidHamed Dehghanpour, Barujb|0000-0003-3822-6622en_US
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112Xen_US
dc.citation.epage14901en_US
dc.citation.issueNumber14en_US
dc.citation.spage14895en_US
dc.citation.volumeNumber40en_US
dc.contributor.authorDelikanlı, Savaş
dc.contributor.authorDurmuşoğlu, E.G.
dc.contributor.authorErdem, Onur
dc.contributor.authorShabani, Farzan
dc.contributor.authorKumar, Satish
dc.contributor.authorBarujb, Hamed Dehghanpour
dc.contributor.authorDemir, Hilmi Volkan
dc.contributor.authorIşık, Furkan
dc.contributor.authorCanımkurbey, Betül
dc.contributor.bilkentauthorDelikanlı, Savaş
dc.contributor.bilkentauthorIşık, Furkan
dc.contributor.bilkentauthorErdem, Onur
dc.contributor.bilkentauthorShabani, Farzan
dc.contributor.bilkentauthorCanımkurbey, Betül
dc.contributor.bilkentauthorKumar, Satish
dc.contributor.bilkentauthorHamed Dehghanpour, Barujb
dc.contributor.bilkentauthorDemir, Hilmi Volkan
dc.date.accessioned2023-02-16T12:44:51Z
dc.date.available2023-02-16T12:44:51Z
dc.date.issued2022-09-25
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractAlthough achieving optical gain using aqueous solutions of colloidal nanocrystals as a gain medium is exceptionally beneficial for bio-optoelectronic applications, the realization of optical gain in an aqueous medium using solution-processed nanocrystals has been extremely challenging because of the need for surface modification to make nanocrystals water dispersible while still maintaining their gain. Here, we present the achievement of optical gain in an aqueous medium using an advanced architecture of CdSe/CdS@CdxZn1−xS core/crown@gradient-alloyed shell colloidal quantum wells (CQWs) with an ultralow threshold of ∼3.4 μJ cm−2 and an ultralong gain lifetime of ∼2.6 ns. This demonstration of optical gain in an aqueous medium is a result of the carefully heterostructured CQWs having large absorption cross-section and gain cross-section in addition to inherently slow Auger recombination in these CQWs. Furthermore, we show low-threshold in-water amplified spontaneous emission (ASE) from these aqueous CQWs with a threshold of 120 μJ cm−2. In addition, we demonstrate a whispering gallery mode laser with a low threshold of ∼30 μJ cm−2 obtained by incorporating films of CQWs by exploiting layer-by-layer approach on a fiber. The observation of low-threshold optical gain with ultralong gain lifetime presents a significant step toward the realization of advanced optofluidic colloidal lasers and their continuous-wave pumping.en_US
dc.identifier.doi10.1039/D2NR03659Ben_US
dc.identifier.eissn2040-3372
dc.identifier.urihttp://hdl.handle.net/11693/111462
dc.language.isoEnglishen_US
dc.publisherRoyal Society of Chemistryen_US
dc.relation.isversionofhttps://doi.org/10.1039/D2NR03659Ben_US
dc.source.titleNanoscaleen_US
dc.titleObservation of optical gain from aqueous quantum well heterostructures in wateren_US
dc.typeArticleen_US
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