Transverse Chiral Optical Forces by Chiral Surface Plasmon Polaritons
arXiv:1509.04270 · doi:10.1021/acsphotonics.5b00516
Abstract
Recently the new concepts of transverse spin angular momentum and Belinfante spin momentum of evanescent waves have drawn considerable attention. Here, we investigate these novel physical properties of electromagnetic fields in the context of locally excited surface plasmon polaritons. We demonstrate, both analytically and numerically, that locally excited surface plasmon polaritons possess transverse spin angular momentum and Belinfante momentum with rich and non-trivial characteristics. We also show that the transverse spin angular momentum of locally excited surface plasmon polaritons leads to the emergence of transverse chiral forces in opposite directions for chiral objects of different handedness. The magnitude of such a transverse force is comparable to the optical gradient force and scattering forces. This finding may pave the way for realization of optical separation of chiral biomolecules.
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- Intelligent Nanophotonics: Merging Photonics and Artificial Intelligence at the Nanoscale
- Universal Spin-Momentum Locked Optical Forces
- Macroscopic direct observation of optical spin-dependent lateral forces and left-handed torques
- Emergence of transverse spin in optical modes of semiconductor nanowires
- Dominant chiral optical forces in vicinity of optical nanofibers
- Probing the optical chiral response of single nanoparticles with optical tweezers
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- Coherent perfect absorption mediated enhancement of transverse spin in a gap plasmon guide
- Spin Photonics in 3D Whispering Gallery Mode Resonators
- Anisotropy-induced Extrinsic Chirality and Chiral Discrimination of Surface Plasmon Polaritons
- Experimental observation of transverse spin of plasmon polaritons in a single-crystalline silver nanowire