Design of low-threshold compact Au-nanoparticle lasers

X. F. Li, Siu Fung Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

31 Citations (Scopus)


We performed a rigorous study to reduce threshold gain of Au-nanoparticle lasers in the deep-subwavelength scale with the consideration of strong interband transitions in Au and device dimensions. We found that the high-threshold optical gain of the nanolaser (over 105 cm -1, which is matched with the result estimated from a previous article [Nature 460,1110 (2009)]) arises from the high interband transition of Au near 530 nm. It can be shown that by increasing the background index, as well as optimizing the lasing wavelength and device dimensions, the threshold gain (cavity volume) can be reduced by 43% (90%).
Original languageEnglish
Pages (from-to)2535-2537
Number of pages3
JournalOptics Letters
Issue number15
Publication statusPublished - 1 Aug 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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