Related Researcher

Author's Photo

Kwak, Sang Kyu
Kyu’s MolSim Lab @ UNIST
Research Interests
  • Molecular modeling and simulation, statistical thermodynamics, molecular physics


Continuous-wave upconversion lasing with a sub-10 W cm(-2) threshold enabled by atomic disorder in the host matrix

DC Field Value Language Moon, Byeong-Seok ko Lee, Tae Kyung ko Jeon, Woo Cheol ko Kwak, Sang Kyu ko Kim, Young-Jin ko Kim, Dong-Hwan ko 2021-09-09T08:40:55Z - 2021-08-20 ko 2021-07 ko
dc.identifier.citation NATURE COMMUNICATIONS, v.12, no.1, pp.4437 ko
dc.identifier.issn 2041-1723 ko
dc.identifier.uri -
dc.description.abstract Microscale lasers efficiently deliver coherent photons into small volumes for intracellular biosensors and all-photonic microprocessors. Such technologies have given rise to a compelling pursuit of ever-smaller and ever-more-efficient microlasers. Upconversion microlasers have great potential owing to their large anti-Stokes shifts but have lagged behind other microlasers due to their high pump power requirement for population inversion of multiphoton-excited states. Here, we demonstrate continuous-wave upconversion lasing at an ultralow lasing threshold (4.7Wcm(-2)) by adopting monolithic whispering-gallery-mode microspheres synthesized by laser-induced liquefaction of upconversion nanoparticles and subsequent rapid quenching ("liquid-quenching"). Liquid-quenching completely integrates upconversion nanoparticles to provide high pump-to-gain interaction with low intracavity losses for efficient lasing. Atomic-scale disorder in the liquid-quenched host matrix suppresses phonon-assisted energy back transfer to achieve efficient population inversion. Narrow laser lines were spectrally tuned by up to 3.56nm by injection pump power and operation temperature adjustments. Our low-threshold, wavelength-tunable, and continuous-wave upconversion microlaser with a narrow linewidth represents the anti-Stokes-shift microlaser that is competitive against state-of-the-art Stokes-shift microlasers, which paves the way for high-resolution atomic spectroscopy, biomedical quantitative phase imaging, and high-speed optical communication via wavelength-division-multiplexing. Upconversion microlasers present a lot of advantages but also require high pumping powers. Here the authors present a high-performing microlaser based on anti-Stokes-shift in upconversion nanoparticles synthesized using a technique of liquid quenching. ko
dc.language 영어 ko
dc.publisher NATURE RESEARCH ko
dc.title Continuous-wave upconversion lasing with a sub-10 W cm(-2) threshold enabled by atomic disorder in the host matrix ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85110947829 ko
dc.identifier.wosid 000679964000007 ko
dc.type.rims ART ko
dc.identifier.doi 10.1038/s41467-021-24751-z ko
dc.identifier.url ko
Appears in Collections:
ECHE_Journal Papers

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show simple item record


  • mendeley


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.