Plasmonic lasing of nanocavity embedding in metallic nanoantenna array.
Nano Lett
; 15(2): 1382-7, 2015 Feb 11.
Article
em En
| MEDLINE
| ID: mdl-25622291
ABSTRACT
Plasmonic nanolasers have ultrahigh lasing thresholds, especially those devices for which all three dimensions are truly subwavelength. Because of a momentum mismatch between the propagating light and localized optical field of the subwavelength nanocavity, poor optical pumping efficiency is another important reason for the ultrahigh threshold but is normally always ignored. On the basis of a cavity-embedded nanoantenna array design, we demonstrate a room-temperature low-threshold plasmonic nanolaser that is robust, reproducible, and easy-to-fabricate using chemical-template lithography. The mode volume of the device is â¼0.22(λ/2n)(3) (here, λ is resonant wavelength and n is the refractive index), and the experimental lasing threshold produced is â¼2.70MW/mm(2). The lasing polarization and the function of nanoantenna array are investigated in detail. Our work provides a new strategy to achieve room-temperature low-threshold plasmonic nanolasers of interest in applications to biological sensoring and information technology.
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Nanoestruturas
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En
Revista:
Nano Lett
Ano de publicação:
2015
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Article
País de afiliação:
China