A room temperature low-threshold ultraviolet plasmonic nanolaser

Qing Zhang, Guangyuan Li, Xinfeng Liu, Fang Qian, Yat Li, Tze Chien Sum, Charles M. Lieber () and Qihua Xiong ()
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Qing Zhang: School of Physical and Mathematical Sciences, Nanyang Technological University
Guangyuan Li: School of Physical and Mathematical Sciences, Nanyang Technological University
Xinfeng Liu: School of Physical and Mathematical Sciences, Nanyang Technological University
Fang Qian: Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory
Yat Li: University of California
Tze Chien Sum: School of Physical and Mathematical Sciences, Nanyang Technological University
Charles M. Lieber: Harvard University
Qihua Xiong: School of Physical and Mathematical Sciences, Nanyang Technological University

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: Abstract Constrained by large ohmic and radiation losses, plasmonic nanolasers operated at visible regime are usually achieved either with a high threshold (102–104 MW cm−2) or at cryogenic temperatures (4–120 K). Particularly, the bending-back effect of surface plasmon (SP) dispersion at high energy makes the SP lasing below 450 nm more challenging. Here we demonstrate the first strong room temperature ultraviolet (~370 nm) SP polariton laser with an extremely low threshold (~3.5 MW cm−2). We find that a closed-contact planar semiconductor–insulator–metal interface greatly lessens the scattering loss, and more importantly, efficiently promotes the exciton–SP energy transfer thus furnishes adequate optical gain to compensate the loss. An excitation polarization-dependent lasing action is observed and interpreted with a microscopic energy-transfer process from excitons to SPs. Our work advances the fundamental understanding of hybrid plasmonic waveguide laser and provides a solution of realizing room temperature UV nanolasers for biological applications and information technologies.

Date: 2014
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DOI: 10.1038/ncomms5953

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