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- Polimeno, P., et al.
(författare)
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Gain-Assisted Optomechanical Position Locking of Metal/Dielectric Nanoshells in Optical Potentials
- 2020
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Ingår i: Acs Photonics. - : American Chemical Society (ACS). - 2330-4022. ; 7:5, s. 1262-1270
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Tidskriftsartikel (refereegranskat)abstract
- We investigate gain-assisted optical forces on dye-enriched silver nanoshell in the quasi-static limit by means of a theoretical/numerical approach. We demonstrate the onset of nonlinear optical trapping of these resonant nanostructures in a counter-propagating Gaussian beam configuration. We study the optical forces and trapping behavior as a function of wavelength, particle gain level, and laser power. We support the theoretical analysis with Brownian dynamics simulations that show how particle position locking is achieved at high gains in extended optical trapping potentials. Finally, for wavelengths blue-detuned with respect to the plasmon-enhanced resonance, we observe particle channeling by the standing wave antinodes due to gradient force reversal. This work opens perspectives for gain-assisted optomechanics where nonlinear optical forces are finely tuned to efficiently trap, manipulate, channel, and deliver an externally controlled nanophotonic system.
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| 3. |
- Polimeno, P., et al.
(författare)
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Position locking of a resonant gain-assisted metallic/dielectric nano-shell in Optical Tweezers
- 2021
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Ingår i: Nuovo Cimento C-Colloquia and Communications in Physics. - 2037-4909. ; 44:4-5
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Tidskriftsartikel (refereegranskat)abstract
- We calculate optical forces on dye-enriched resonant nano-shells in dual-beam Optical Tweezers. We investigate the non-linear gain-assisted enhancement of their optomechanics and study their behaviour through Brownian dynamics simulations. When the wavelength is red detuned with respect to the plasmon resonance, we observe that the particles are efficiently trapped at the laser beam intensity maxima of the dual beam standing wave. Conversely, for blue-detuned wavelengths the nano-shells are channelled through the standing wave antinodes due to the sign reversal of the optical force. This open perspectives for gain-assisted optomechanics where non-linear optical forces are finely tuned to manipulate controlled nano-photonic systems.
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