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Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces

Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces

Published on: July 26, 2016

Unlocked evanescent waves in periodic structures.

Muriel Botey¹, Yu-Chieh Cheng, Vicent Romero-Garcia

¹Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Urgell 187, Barcelona 08036, Spain. muriel.botey@upc.edu

|June 1, 2013

Summary

This summary is machine-generated.

We predict new evanescent modes in 2D dielectric periodic structures with unlocked phases. These unlocked evanescent waves enable novel spatial effects, unlike in 1D structures.

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Area of Science:

* Physics
* Materials Science
* Electromagnetism

Background:

* Evanescent modes in one-dimensional (1D) dielectric periodic structures are known to lock to the host modulation.
* Understanding wave behavior in two-dimensional (2D) periodic materials is crucial for advanced optical applications.

Purpose of the Study:

* To predict and characterize a new class of evanescent modes in 2D dielectric periodic structures.
* To investigate the potential for spatial effects using these novel evanescent waves.
* To demonstrate beam focalization within photonic crystal slabs.

Main Methods:

* Theoretical prediction of evanescent mode behavior in 2D dielectric periodic structures.
* Analysis of wave vector properties for evanescent modes.
* Simulation of beam propagation and focalization in flat photonic crystal slabs.

Main Results:

* Existence of evanescent modes with unlocked phases in 2D dielectric periodic structures predicted.
* Demonstrated that the real part of the wave vector for these modes is unlocked.
* Showcased significant focalization of beams within the band gap of a flat photonic crystal slab.

Conclusions:

* A new class of evanescent modes with unlocked phases exists in 2D periodic dielectric systems.
* These unlocked evanescent waves can lead to observable spatial effects.
* The phenomenon is expected to be general for spatially modulated materials, with implications for photonic devices.