Spaser for sensing applications

Dorofeenko, A. V.; Lozovik, Yu. E.; Nechepurenko, I. A.; Andrianov, E. S.; Pukhov, A. A.
September 2012
AIP Conference Proceedings;9/2/2012, Vol. 1475 Issue 1, p53
Academic Journal
A new method of high-sensitive subwavelength spectromicroscopy is proposed based on usage of near field of spaser having a form of a tip of scanning probe microscope. The high spatial resolution is defined by the curvature of the tip, as for apertureless scanning near field optical microscopy. In contrast to the latter method, we suggest using radiationless pumping of plasmon by neighboring quantum dots instead of irradiation of the tip by external laser beam. Spaser generation spectrum is analyzed. The plasmon generation is suppressed due to absorption at the transition frequencies of neighbouring nano-objects (molecules, clusters) under study. As a result, in wide plasmon generation spectrum narrow dips appear. The highest sensitivity is achieved near the spaser generation threshold.


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