Slow light bimodal interferometry in one-dimensional photonic crystal waveguides

Luis Torrijos-Morán; Amadeu Griol; Jaime García-Rupérez

doi:10.1038/s41377-020-00460-y

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Slow light bimodal interferometry in one-dimensional photonic crystal waveguides

Articles

- Slow light bimodal interferometry in one-dimensional photonic crystal waveguides
- Light: Science & Applications Vol. 10, Issue 2, Pages: 154-165(2021)
- Affiliations：
  
  Nanophotonics Technology Center, Universitat Politècnica de València, 46022 Valencia, Spain
- Author bio：
  
  Luis Torrijos-Morán (luitorm2@ntc.upv.es)
  Jaime GarcíaRupérez (jaigarru@ntc.upv.es)
- Funds：
- DOI：10.1038/s41377-020-00460-y
  CLC：
- Published：2021，
  
  Published Online：14 January 2021，
  
  Received：20 July 2020，
  
  Revised：23 December 2020，
  
  Accepted：28 December 2020
- Accepted：
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Torrijos-Morán, L., Griol, A. & García-Rupérez, J. Slow light bimodal interferometry in one-dimensional photonic crystal waveguides. Light: Science & Applications, 10, 154-165 (2021).
DOI：

Torrijos-Morán, L., Griol, A. & García-Rupérez, J. Slow light bimodal interferometry in one-dimensional photonic crystal waveguides. Light: Science & Applications, 10, 154-165 (2021). DOI： 10.1038/s41377-020-00460-y.

摘要

Abstract

Strongly influenced by the advances in the semiconductor industry

the miniaturization and integration of optical circuits into smaller devices has stimulated considerable research efforts in recent decades. Among other structures

integrated interferometers play a prominent role in the development of photonic devices for on-chip applications ranging from optical communication networks to point-of-care analysis instruments. However

it has been a long-standing challenge to design extremely short interferometer schemes

as long interaction lengths are typically required for a complete modulation transition. Several approaches

including novel materials or sophisticated configurations

have been proposed to overcome some of these size limitations but at the expense of increasing fabrication complexity and cost. Here

we demonstrate for the first time slow light bimodal interferometric behaviour in an integrated single-channel one-dimensional photonic crystal. The proposed structure supports two electromagnetic modes of the same polarization that exhibit a large group velocity difference. Specifically

an over 20-fold reduction in the higher-order-mode group velocity is experimentally shown on a straightforward all-dielectric bimodal structure

leading to a remarkable optical path reduction compared to other conventional interferometers. Moreover

we experimentally demonstrate the significant performance improvement provided by the proposed bimodal photonic crystal interferometer in the creation of an ultra-compact optical modulator and a highly sensitive photonic sensor.

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references

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