Strong optical force induced by morphology-dependent resonances

Jack Ng; C. T. Chan; Ping Sheng; Zhifang Lin

doi:10.1364/ol.30.001956

A Nanoscale Photonic Crystal Cavity Optomechanical System for Ultrasensitive Motion Sensing

Crystals ◽

10.3390/cryst11050462 ◽

2021 ◽

Vol 11 (5) ◽

pp. 462

Author(s):

Ji Xia ◽

Fuyin Wang ◽

Chunyan Cao ◽

Zhengliang Hu ◽

Heng Yang ◽

...

Keyword(s):

Photonic Crystal ◽

Optical Cavity ◽

Optical Quality ◽

Optical Force ◽

Mechanical Oscillator ◽

Maximum Displacement ◽

Optomechanical System ◽

High Optical Quality ◽

Hybrid Platform ◽

Optomechanical Coupling

Optomechanical nanocavities open a new hybrid platform such that the interaction between an optical cavity and mechanical oscillator can be achieved on a nanophotonic scale. Owing to attractive advantages such as ultrasmall mass, high optical quality, small mode volume and flexible mechanics, a pair of coupled photonic crystal nanobeam (PCN) cavities are utilized in this paper to establish an optomechanical nanosystem, thus enabling strong optomechanical coupling effects. In coupled PCN cavities, one nanobeam with a mass meff~3 pg works as an in-plane movable mechanical oscillator at a fundamental frequency of . The other nanobeam couples light to excite optical fundamental supermodes at and 1554.464 nm with a larger than 4 × 104. Because of the optomechanical backaction arising from an optical force, abundant optomechanical phenomena in the unresolved sideband are observed in the movable nanobeam. Moreover, benefiting from the in-plane movement of the flexible nanobeam, we achieved a maximum displacement of the movable nanobeam as 1468 . These characteristics indicate that this optomechanical nanocavity is capable of ultrasensitive motion measurements.

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Phase Profile in Superposition of Bessel Beam Modulates Local Axial Optical Force on Rayleigh and Mie Dielectric Spheres

Optik ◽

10.1016/j.ijleo.2021.167032 ◽

2021 ◽

pp. 167032

Author(s):

Eungkyu Lee ◽

Seunghyun Moon ◽

Tengfei Luo

Keyword(s):

Bessel Beam ◽

Optical Force ◽

Phase Profile ◽

Dielectric Spheres

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Optical force-based detection of splay and twist viscoelasticity of CCN47 across the Nematic-to-Smectic A transition

Journal of Molecular Liquids ◽

10.1016/j.molliq.2021.115520 ◽

2021 ◽

Vol 329 ◽

pp. 115520

Author(s):

Liana Lucchetti ◽

Giovanni Nava ◽

Raouf Barboza ◽

Fabrizio Ciciulla ◽

Tommaso Bellini

Keyword(s):

Optical Force ◽

Smectic A

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Plasmonic linear nanomotor using lateral optical forces

Science Advances ◽

10.1126/sciadv.abc3726 ◽

2020 ◽

Vol 6 (45) ◽

pp. eabc3726

Author(s):

Yoshito Y. Tanaka ◽

Pablo Albella ◽

Mohsen Rahmani ◽

Vincenzo Giannini ◽

Stefan A. Maier ◽

...

Keyword(s):

Laser Beam ◽

Incident Light ◽

Lateral Force ◽

Diffraction Limit ◽

Propagation Direction ◽

Optical Force ◽

Optical Forces ◽

Incident Laser ◽

New Class ◽

Force Direction

Optical force is a powerful tool to actuate micromachines. Conventional approaches often require focusing and steering an incident laser beam, resulting in a bottleneck for the integration of the optically actuated machines. Here, we propose a linear nanomotor based on a plasmonic particle that generates, even when illuminated with a plane wave, a lateral optical force due to its directional side scattering. This force direction is determined by the orientation of the nanoparticle rather than a field gradient or propagation direction of the incident light. We demonstrate the arrangements of the particles allow controlling the lateral force distributions with the resolution beyond the diffraction limit, which can produce movements, as designed, of microobjects in which they are embedded without shaping and steering the laser beam. Our nanomotor to engineer the experienced force can open the door to a new class of micro/nanomechanical devices that can be entirely operated by light.

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