Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 1, Issue 15, Pages 2327-2333Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz100659x
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [19049004, 20550002]
- Global COE Program [B01]
- Grants-in-Aid for Scientific Research [19049004, 20550002] Funding Source: KAKEN
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One of the recent hot topics in the fields of plasmonics and related nanophotonics is optical trapping of nano/microparticles based on surface plasmon. Experimental demonstration of such trapping by gap-mode plasmon has hitherto been limited so far to a few reports in which submicrometer polymer beads were trapped with intense irradiation at MW/cm(2), satisfying an energetic condition of U > kT. (U is the potential energy of the trap and kT is an averaged thermal background energy.) We demonstrate plasmon-based optical trapping of a luminescent quantum dot (Q dot, diameter >= 10 nm) with a very weak irradiation (0.5-10 kW/cm(2)). The most important discovery is that the Q dot trapping was clearly observed through luminescence detection even under an energetic condition of U < kT, on the basis of which we propose a novel concept that is peculiar to plasmon-based trapping at a nanogap.
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