Power and spectral characterization of a SOI chip-based axicon-like lens with 850um-long, 5.7um-diameter central lobe

Rijan Maharjan; Sanket Bohora; Pravin Bhattarai; Iain Crowe; Richard J. Curry; Richard Hogg; David Childs; Ashim Dhakal

doi:10.1117/12.2583191

4 October 2020 Power and spectral characterization of a SOI chip-based axicon-like lens with 850μm-long, 5.7μm-diameter central lobe

Rijan Maharjan, Sanket Bohora, Pravin Bhattarai, Iain Crowe, Richard J. Curry, Richard Hogg, David Childs, Ashim Dhakal

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Proceedings Volume 11577, Emerging Applications in Silicon Photonics; 115770A (2020) https://doi.org/10.1117/12.2583191
Event: SPIE Photonex and Vacuum Expo, 2020, Online Only

Abstract

We present here a photonic chip based axicon like lens that has a 850 um long central lobe, with a diameter of 5.7 um. The 1.52 mm x 1.38 mm device consists of circular grating with a novel azimuthal apodization to increase light penetration depth by an order of magnitude and multiple stages of 1x2 multimode interferometer splitters/combiners. We characterize the axicon with a swept source laser (1300 +/- 50 nm) coupled in with a GRIN lens onto the device, with the light out-coupled from a regular grating coupler. We also characterize the spectral performance of the device, using balanced homodyne detection to resolve the power, and show that the position of the central lobe does not vary significantly with wavelength.

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Rijan Maharjan, Sanket Bohora, Pravin Bhattarai, Iain Crowe, Richard J. Curry, Richard Hogg, David Childs, and Ashim Dhakal "Power and spectral characterization of a SOI chip-based axicon-like lens with 850μm-long, 5.7μm-diameter central lobe", Proc. SPIE 11577, Emerging Applications in Silicon Photonics, 115770A (4 October 2020); https://doi.org/10.1117/12.2583191

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