Directive Emission from Defect-Free Dodecagonal Photonic Quasicrystals: A Leaky-Wave Characterization

TL;DR

This paper investigates radiation from defect-free dodecagonal photonic quasicrystals, revealing broadside, high-directivity emission at multiple frequencies through leaky-wave support, supported by full-wave simulations.

Contribution

It introduces a leaky-wave characterization of radiation in photonic quasicrystals, demonstrating broadside emission with high directivity and low sidelobes in aperiodic structures.

Findings

Broadside radiation achieved at multiple frequencies.

High directivity of approximately 15 dB.

Beamwidth proportional to leaky-wave attenuation.

Abstract

In this paper, we study the radiation from embedded sources in two-dimensional finite-size "photonic-quasicrystal" (PQC) slabs made of dielectric rods arranged according to a 12-fold symmetric aperiodic tiling. The results from our investigation, based on rigorous full-wave simulations, show the possibility of achieving broadside radiation at multiple frequencies, with high-directivity (e.g., 15 dB) and low-sidelobes (e.g., -12 dB). We also show that leaky waves are supported by a PQC slab, and that the beamwidth is directly proportional to the leaky-wave attenuation constant, which provides a physically-incisive interpretation of the observed radiation characteristics.