Abstract
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 , which is matched with the result estimated from a previous article [Nature 460, 1110 (2009)]) arises from the high interband transition of Au near . 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%).
© 2010 Optical Society of America
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