Spaser spectroscopy with subwavelength spatial resolution |
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Authors: | Yurii E Lozovik Igor A Nechepurenko Alexander V Dorofeenko Eugeny S Andrianov Alexander A Pukhov |
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Institution: | 1. Institute of Spectroscopy RAS, Moscow Region, Troitsk, Russia;2. Moscow Institute of Physics and Technology, Moscow Region, Dolgoprudny, Russia;3. Moscow Institute of Electronics and Mathematics, HSE, Moscow, Russia;4. Institute for Theoretical and Applied Electromagnetics RAS, Moscow, Russia;5. All-Russia Research Institute of Automatics, Moscow, Russia |
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Abstract: | We propose a method for high-sensitivity subwavelength spectromicroscopy based on the usage of a spaser (plasmonic nanolaser) in the form of a scanning probe microscope tip. The high spatial resolution is defined by plasmon localization at the tip, as is the case for apertureless scanning near-field optical microscopy. In contrast to the latter method, we suggest using radiationless plasmon pumping with quantum dots instead of irradiation with an external laser beam. Due to absorption at the transition frequencies of neighboring nano-objects (molecules or clusters), dips appear in the plasmon generation spectrum. The highest sensitivity is achieved near the generation threshold. |
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Keywords: | Plasmonic nanolaser Spaser Microscopy Intracavity spectroscopy |
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