Generating Light with Orbital and Spin Angular Momenta in Silicon Waveguides using Berry’s Phase

Patton, Ryan J.; Reano, Ronald M.

doi:10.1364/cleo_si.2020.stu3j.4

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2021

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“…The waveguide produces a small mode effective area and non-zero and fields which combine with the dominant and fields in (5) to produce a longitudinal spin density . We calculate the normalized integral values of the longitudinal orbital AM and spin AM by integrating ℓ and over the mode area [28], [30]. where 〈⋯ 〉 denotes integration over the transverse plane [28], [31].…”

Section: Resultsmentioning

confidence: 99%

Higher Order Mode Conversion From Berry's Phase in Silicon Optical Waveguides

Patton

Reano

2021

IEEE Photonics J.

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We present mode conversion between the higher order and optical modes in an out-of-plane silicon waveguide exhibiting Berry's phase. Superpositions of the and waveguide modes form quasi-Laguerre-Gaussian modes with total angular momentum of ℏ per photon for a 720 × 600 nm 2 silicon waveguide core. When the waveguide is deflected out-ofplane by 22.5°, 50% mode conversion occurs from the mode to the mode. The concatenation of a quarter wavelength straight section results in an output with . ℏ orbital and . ℏ spin angular momentum per photon. Orbital angular momentum generation in a waveguide platform provides a route for on-chip applications that utilize the angular momentum of light for sensing, optical manipulation, non-linear optics, and communications.

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