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

We present mode conversion between the higher order {{\bf E}}_{21}^{\boldsymbol{x}} and {{\bf E}}_{12}^{\boldsymbol{x}} optical modes in an out-of-plane silicon waveguide exhibiting Berry's phase. Superpositions of the {{\bf E}}_{21}^{\boldsymbol{x}} and {{\bf E}}_{12}^{\boldsymbol{x}} waveguid...

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Bibliographic Details
Published in:IEEE photonics journal 2021-08, Vol.13 (4), p.1-5
Main Authors: Patton, Ryan J., Reano, Ronald M.
Format: Article
Language:English
Subjects:
Angular momentum
Berry phase
Berry's phase
Conversion
integrated optics
mode converters
Nonlinear optics
Optical fibers
optical orbital angular momentum (OAM)
Optical polarization
Optical waveguides
Orbits
Photonics
Photons
Silicon
silicon photonics
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Summary:We present mode conversion between the higher order {{\bf E}}_{21}^{\boldsymbol{x}} and {{\bf E}}_{12}^{\boldsymbol{x}} optical modes in an out-of-plane silicon waveguide exhibiting Berry's phase. Superpositions of the {{\bf E}}_{21}^{\boldsymbol{x}} and {{\bf E}}_{12}^{\boldsymbol{x}} waveguide modes form quasi-Laguerre-Gaussian modes with total angular momentum of 1\hbar per photon for a 720 × 600 nm 2 silicon waveguide core. When the waveguide is deflected out-of-plane by 22.5°, 50% mode conversion occurs from the {{\bf E}}_{21}^{\boldsymbol{x}} mode to the {{\bf E}}_{12}^{\boldsymbol{x}} mode. The concatenation of a quarter wavelength straight section results in an output with 0.89\hbar orbital and 0.15\hbar 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.
ISSN:1943-0655
1943-0655
1943-0647
DOI:10.1109/JPHOT.2021.3104180