Thin-Film Narrowband Retroreflector Based on Waveguide Grating Structure

Kintaka, Kenji; Kusuura, Toshiki; Inoue, Jun‐ichi; Ura, Shogo

doi:10.1109/lpt.2020.3005411

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“…A smaller number of components will simplify alignment process. We have recently proposed and demonstrated a GMR retroreflector for an obliquely incident plane wave, 14,15) but it does not support a diverging wave. Theoretical investigation for a focusing retroreflection with a concave surface was reported 16) though it needs machining of the concave structure.…”

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confidence: 99%

Narrowband focusing retroreflector with a thin-film structure

Inoue

Kusuura

Ueda

et al. 2021

Appl. Phys. Express

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A thin-film narrowband retroreflector is proposed for a diverging free-space wave. The retroreflector consists of a focusing grating coupler in a waveguide resonator on a reflective substrate. The retroreflector is designed and fabricated for an incident wave diverging from a 5.25 μm diameter spot. The retroreflector gives a reflection towards the divergence point of the incident wave at the resonance wavelength determined by the waveguide resonator, but otherwise a specular reflection. The retroreflection spectrum of a 4 nm bandwidth with the peak of 75% is demonstrated. This configuration will provide a lens-less external-cavity-mirror diode laser of a lasing wavelength fixed to the resonance wavelength.

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confidence: 99%