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Efficient and tunable strip-to-slot fundamental mode coupling

Mere, Viphretuo and Kallega, Rakshitha and Selvaraja, Shankar Kumar (2018) Efficient and tunable strip-to-slot fundamental mode coupling. In: OPTICS EXPRESS, 26 (1). pp. 438-444.

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Official URL: http://dx.doi.org/10.1364/OE.26.000438


We present a novel photonic wire-to-slot waveguide coupler in SOI. The phase matching between a wire and slot mode is achieved using a mode transformer. The architecture consists of a balanced 50/50 power splitter and a tunable phase matched taper combiner forming a slot waveguide. We show a theoretical wire-to-slot coupling efficiency of 99 % is achievable and experimentally, we demonstrate a coupling efficiency of 99 % in the 1550 nm band. Based on the coupling scheme, we also show excitation of a slot mode in a slotted ring resonator and verified the excitation through the thermo-optic response of the rings. We show a nearly athermal behaviour of a PMMA filled slot ring with a thermo-optic response of 12.8 pm/degrees C compare to 43.5 pm/degrees C for an air clad slot waveguide. (c) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Item Type: Journal Article
Publisher: 10.1364/OE.26.000438
Additional Information: Copy right for this article belongs to the OPTICAL SOC AMER, 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 02 Mar 2018 15:07
Last Modified: 02 Mar 2018 15:07
URI: http://eprints.iisc.ac.in/id/eprint/58883

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