Experimental validation of a 2D approximation method for investigating photonic components: case study refractive index sensor

Jens Høvik; Astrid Aksnes

doi:10.1117/12.2321121

17 September 2018 Experimental validation of a 2D approximation method for investigating photonic components: case study refractive index sensor

Jens Høvik, Astrid Aksnes

Author Affiliations +

Proceedings Volume 10743, Optical Modeling and Performance Predictions X; 107430V (2018) https://doi.org/10.1117/12.2321121
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

Abstract

Investigating photonic components as refractive index sensors requires reliable numerical models. Performing 3D simulations of large or complex components requires powerful hardware. Alternatives to time-consuming 3D simulations are approximations such as the effective refractive index method. We propose our improved method that more closely follows 3D results, named the inverse effective index method. The accuracy of our approximation method is verified by comparing experimental results with simulations. Ring resonators with 40μm radius are simulated and fabricated. Their qualities as refractive index sensors are assessed by probing their response in DI-water and in various saline solutions. The fabricated resonators are fitted with a microfluidic channel for sample delivery. A tunable laser is used to induce resonance in the ring resonators and the resonance frequencies are measured for all solutions. The accuracy between simulation and experimental data is found to rely heavily on the approximation technique being used. The differences vary from 300% to 6% depending on the approximation method. The fabrication and characterization of the ring resonator-based refractive index sensor took approximately two days, whereas the 2D simulations took under an hour to perform. This demonstrates the usefulness of a proper simulation tool to conduct accurate performance estimations in a short amount of time.

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Jens Høvik and Astrid Aksnes "Experimental validation of a 2D approximation method for investigating photonic components: case study refractive index sensor", Proc. SPIE 10743, Optical Modeling and Performance Predictions X, 107430V (17 September 2018); https://doi.org/10.1117/12.2321121

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KEYWORDS

Refractive index

Resonators

Waveguides

Silicon

Sensors

Wave propagation

Device simulation

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