All-colloidal parity–time-symmetric microfiber lasers balanced between the gain of colloidal quantum wells and the loss of colloidal metal nanoparticles

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buir.contributor.authorForoutan-Barenji, Sina
buir.contributor.authorShabani, Farzan
buir.contributor.authorIşık, Ahmet Tarik
buir.contributor.authorDikmen, Zeynep
buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidForoutan-Barenji, Sina|0000-0003-0623-8987
buir.contributor.orcidShabani, Farzan|0000-0003-2174-5960
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage13762en_US
dc.citation.issueNumber14en_US
dc.citation.spage13755en_US
dc.citation.volumeNumber37en_US
dc.contributor.authorForoutan-Barenji, Sina
dc.contributor.authorShabani, Farzan
dc.contributor.authorIşık, Ahmet Tarik
dc.contributor.authorDikmen, Zeynep
dc.contributor.authorDemir, Hilmi Volkan
dc.date.accessioned2023-02-16T11:15:36Z
dc.date.available2023-02-16T11:15:36Z
dc.date.issued2022-08-23
dc.departmentDepartment of Chemistryen_US
dc.description.abstractLasers based on semiconductor colloidal quantum wells (CQWs) have attracted wide attention, thanks to their facile solution-processability, low threshold and wide range spectral tunability. Colloidal microlasers based on whispering-gallery-mode (WGM) resonators have already been widely demonstrated. However, due to their microscale size typically supporting multiple modes, they suffer from multimode competition and higher threshold. The ability to control the multiplicity of modes oscillating within colloidal laser resonators and achieving single-mode lasers is of fundamental importance in many photonic applications. Here we show that as a unique, simple and versatile architecture of all-colloidal lasers intrinsically enabled by balanced gain/loss segments, the lasing threshold reduction and spectral purification can be readily achieved in a system of a WGM-supported microfiber cavity by harnessing the notions of parity–time symmetry (PT). In particular, we demonstrate a proof-of-concept PT-symmetric microfiber laser employing CQWs as the colloidal gain medium along with a carefully tuned nanocomposite of Ag nanoparticles (Ag NPs) incorporated into a PMMA matrix altogether and conveniently coated around a coreless microfiber as a rigorously tailored colloidal loss medium to balance the gain. The realization of gain/loss segments in our PT-symmetric all-colloidal arrangement is independent of selected pumping, reducing the complexity of the system and making compact device applications feasible, where control over the pumping is not possible. We observed a reduction in the number of modes, resulting in a reduced threshold and enhanced output power of the PT-symmetric laser. The PT-symmetric CQW-WGM microcavity architecture offers new opportunities towards simple implementation of high-performance optical resonators for colloidal lasers.en_US
dc.description.provenanceSubmitted by Samet Emre (samet.emre@bilkent.edu.tr) on 2023-02-16T11:15:35Z No. of bitstreams: 1 All-colloidal_parity–time-symmetric_microfiber_lasers_balanced_between_the_gain_of_colloidal_quantum_wells_and_the_loss_of_colloidal_metal_nanoparticles.pdf: 1621257 bytes, checksum: 2e1e562039a2d1e164bd196b40bdc423 (MD5)en
dc.description.provenanceMade available in DSpace on 2023-02-16T11:15:36Z (GMT). No. of bitstreams: 1 All-colloidal_parity–time-symmetric_microfiber_lasers_balanced_between_the_gain_of_colloidal_quantum_wells_and_the_loss_of_colloidal_metal_nanoparticles.pdf: 1621257 bytes, checksum: 2e1e562039a2d1e164bd196b40bdc423 (MD5) Previous issue date: 2022-08-23en
dc.identifier.doi10.1039/D2NR02146Cen_US
dc.identifier.eissn2040-3372
dc.identifier.urihttp://hdl.handle.net/11693/111445
dc.language.isoEnglishen_US
dc.publisherRoyal Society of Chemistryen_US
dc.relation.isversionofhttps://doi.org/10.1039/D2NR02146Cen_US
dc.source.titleNanoscaleen_US
dc.titleAll-colloidal parity–time-symmetric microfiber lasers balanced between the gain of colloidal quantum wells and the loss of colloidal metal nanoparticlesen_US
dc.typeArticleen_US

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Department of Electrical and Electronics Engineering
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