2010
DOI: 10.1021/jz100659x
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Optical Trapping of Quantum Dots Based on Gap-Mode-Excitation of Localized Surface Plasmon

Abstract: 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/cm2, 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 … Show more

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Cited by 126 publications
(121 citation statements)
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References 21 publications
(41 reference statements)
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“…Optical antennas exploit the resonant behavior and large scattering cross section of plasmons in nanostructured metals for use in a wide variety of applications including surface-enhanced Raman spectroscopy (SERS) 1,2 , subwavelength optics 3,4 , plasmonic optical trapping [5][6][7][8] , and plasmon-assisted light harvesting [9][10][11][12][13][14][15][16][17] . Photosensitive devices utilizing plasmonic nanoantennas generate photocurrent through two dominant mechanisms:…”
Section: Introductionmentioning
confidence: 99%
“…Optical antennas exploit the resonant behavior and large scattering cross section of plasmons in nanostructured metals for use in a wide variety of applications including surface-enhanced Raman spectroscopy (SERS) 1,2 , subwavelength optics 3,4 , plasmonic optical trapping [5][6][7][8] , and plasmon-assisted light harvesting [9][10][11][12][13][14][15][16][17] . Photosensitive devices utilizing plasmonic nanoantennas generate photocurrent through two dominant mechanisms:…”
Section: Introductionmentioning
confidence: 99%
“…15−24 We also demonstrated the LSP-OT of semiconductor nanocrystals (quantum dots) and polystyrene nanospheres and by means of confocal fluorescence microspectroscopy. 22−24 Such LSP-OT has a great advantage with respect to incident light intensity: the laser intensity can be much decreased (to the order of kW/cm 2 ) and still achieve stable trapping, as compared to conventional optical tweezers (∼MW/cm 2 ). 25−29 Thus, LSP-OT could enable a new technique for manipulating not only nanoparticles but also smaller molecules such as polymer chains, 24 proteins, and DNA.…”
Section: ■ Introductionmentioning
confidence: 99%
“…In addition to optical gradients, coupling to the surface plasmon resonances can produce local heating in the metal and heat dissipation within the chamber, which results in convection. However, a local temperature elevation in the gold nanostructure for low incident intensity of 750 W/cm 2 is estimated to be less than 0.1 °C from some previous reports which experimentally and theoretically evaluate it [9,23]. Thus, the trapping contribution from plasmon-thermal fluid convection can be negligible.…”
mentioning
confidence: 91%
“…The optical trapping of nanometer-sized objects by using plasmonic nanostructures has attracted considerable attention in recent years because it significantly improves the trapping performance compared with conventional optical tweezers that use a tightly focused laser beam [1][2][3][4][5][6][7][8][9]. Localized surface plasmons, i.e., resonant charge-density oscillations confined to metal nanostructures, can efficiently convert propagating light into nanoscale confined and strongly enhanced optical fields, which generate high-intensity gradients responsible for the trapping mechanism.…”
mentioning
confidence: 99%
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