Spatially Shaping Waves to Penetrate Deep inside a Forbidden Gap

It is well known that waves with frequencies within the forbidden gap inside a crystal are transported only over a limited distance-the Bragg length-before being reflected by Bragg interference. Here, we demonstrate how to send waves much deeper into crystals in an exemplary study of light in two-di...

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Bibliographic Details
Published in:Physical review letters 2021-04, Vol.126 (17), p.177402-177402, Article 177402
Main Authors: Uppu, Ravitej, Adhikary, Manashee, Harteveld, Cornelis A M, Vos, Willem L
Format: Article
Language:English
Subjects:
Flux density
Internal energy
Photonic crystals
Random waves
Wave fronts
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Summary:It is well known that waves with frequencies within the forbidden gap inside a crystal are transported only over a limited distance-the Bragg length-before being reflected by Bragg interference. Here, we demonstrate how to send waves much deeper into crystals in an exemplary study of light in two-dimensional silicon photonic crystals. By spatially shaping the wave fronts, the internal energy density-probed via the laterally scattered intensity-is enhanced at a tunable distance away from the front surface. The intensity is up to 100× enhanced compared to random wave fronts, and extends as far as 8× the Bragg length, which agrees with an extended mesoscopic model. We thus report a novel control knob for mesoscopic wave transport that pertains to any kind of waves.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.126.177402