All-dielectric scale invariant waveguide

Janderson R. Rodrigues, Utsav D. Dave, Aseema Mohanty, Xingchen Ji, Ipshita Datta, Shriddha Chaitanya, Euijae Shim, Ricardo Gutierrez-Jauregui, Vilson R. Almeida, Ana Asenjo-Garcia and Michal Lipson ()
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Janderson R. Rodrigues: Columbia University
Utsav D. Dave: Columbia University
Aseema Mohanty: Tufts University
Xingchen Ji: Shanghai Jiao Tong University
Ipshita Datta: Columbia University
Shriddha Chaitanya: Columbia University
Euijae Shim: Columbia University
Ricardo Gutierrez-Jauregui: Columbia University
Vilson R. Almeida: Aeronautics Institute of Technology
Ana Asenjo-Garcia: Columbia University
Michal Lipson: Columbia University

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Total internal reflection (TIR) governs the guiding mechanisms of almost all dielectric waveguides and therefore constrains most of the light in the material with the highest refractive index. The few options available to access the properties of lower-index materials include designs that are either lossy, periodic, exhibit limited optical bandwidth or are restricted to subwavelength modal volumes. Here, we propose and demonstrate a guiding mechanism that leverages symmetry in multilayer dielectric waveguides as well as evanescent fields to strongly confine light in low-index materials. The proposed waveguide structures exhibit unusual light properties, such as uniform field distribution with a non-Gaussian spatial profile and scale invariance of the optical mode. This guiding mechanism is general and can be further extended to various optical structures, employed for different polarizations, and in different spectral regions. Therefore, our results can have huge implications for integrated photonics and related technologies.

Date: 2023
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DOI: 10.1038/s41467-023-42234-1

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