Local circular polarizations in nanostructures induced by linear polarization via optical near-fields

Naruse, Makoto; Tani, Tohru; Inoue, Tetsuya; Yasuda, Hideki; Hori, Hirokazu; Naya, Masayuki

doi:10.1364/josab.32.001797

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…Previously, the classification of modes with respect to their polarization has been done from the near-fields directly. 23 The analysis with the help of optical chirality complements these findings and generalizes concepts such as local circular polarization 24 and degree of circular polarization 25 which depend on the choice of a specific propagation direction. This generalization will be introduced in the following sections.…”

Section: Chirality Energy and Polarizationsupporting

confidence: 54%

Time-harmonic optical chirality in inhomogeneous space

et al. 2016

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Optical chirality has been recently suggested to complement the physically relevant conserved quantities of the well-known Maxwell's equations. This time-even pseudoscalar is expected to provide further insight in polarization phenomena of electrodynamics such as spectroscopy of chiral molecules. Previously, the corresponding continuity equation was stated for homogeneous lossless media only. We extend the underlying theory to arbitrary setups and analyse piecewise-constant material distributions in particular. Our implementation in a Finite Element Method framework is applied to illustrative examples in order to introduce this novel tool for the analysis of time-harmonic simulations of nano-optical devices.

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Section: Chirality Energy and Polarizationsupporting

confidence: 54%

Time-harmonic optical chirality in inhomogeneous space

et al. 2016

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“…At first, we establish the occurrence of an elliptically polarized electric field in the near field of a linear dipole. This notion suggests that linear dipoles may induce circularly polarized dipole moments in neighboring objects ( 30 ) or exert spin-dependent forces and torques on them ( 31 ). Nevertheless, the chirality density of the electromagnetic field of a linear dipole, as defined in ( 32 ), is plain zero, in particular in the far-field, where the emitted light is purely linearly polarized ( 22 ).…”

Section: Discussionmentioning

confidence: 99%

Emission of circularly polarized light by a linear dipole

2019

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Controlling the polarization state and the propagation direction of photons is a fundamental prerequisite for many nanophotonic devices and a precursor for future on-chip communication, where the emission properties of individual emitters are particularly relevant. Here, we report on the emission of partially circularly polarized photons by a linear dipole. The underlying effect is linked to the near-field part of the angular spectrum of the dipole, and it occurs in any type of linear dipole emitter, ranging from atoms and quantum dots to molecules and dipole-like antennas. We experimentally observe it by near-field to far-field transformation at a planar dielectric interface and numerically demonstrate the utility of this phenomenon by coupling the circularly polarized light to the individual paths of crossing waveguides.

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Local circular polarizations in nanostructures induced by linear polarization via optical near-fields

Cited by 2 publications

References 12 publications

Time-harmonic optical chirality in inhomogeneous space

Time-harmonic optical chirality in inhomogeneous space

Emission of circularly polarized light by a linear dipole

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