Photonic quasi-crystal terahertz lasers

Miriam Serena Vitiello (), Michele Nobile, Alberto Ronzani, Alessandro Tredicucci, Fabrizio Castellano, Valerio Talora, Lianhe Li, Edmund H. Linfield and A. Giles Davies
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Miriam Serena Vitiello: NEST, CNR—Istituto Nanoscienze and Scuola Normale Superiore
Michele Nobile: NEST, CNR—Istituto Nanoscienze and Scuola Normale Superiore
Alberto Ronzani: NEST, CNR—Istituto Nanoscienze and Scuola Normale Superiore
Alessandro Tredicucci: NEST, CNR—Istituto Nanoscienze and Scuola Normale Superiore
Fabrizio Castellano: NEST, CNR—Istituto Nanoscienze and Scuola Normale Superiore
Valerio Talora: NEST, CNR—Istituto Nanoscienze and Scuola Normale Superiore
Lianhe Li: School of Electronic and Electrical Engineering, University of Leeds
Edmund H. Linfield: School of Electronic and Electrical Engineering, University of Leeds
A. Giles Davies: School of Electronic and Electrical Engineering, University of Leeds

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Quasi-crystal structures do not present a full spatial periodicity but are nevertheless constructed starting from deterministic generation rules. When made of different dielectric materials, they often possess fascinating optical properties, which lie between those of periodic photonic crystals and those of a random arrangement of scatterers. Indeed, they can support extended band-like states with pseudogaps in the energy spectrum, but lacking translational invariance, they also intrinsically feature a pattern of ‘defects’, which can give rise to critically localized modes confined in space, similar to Anderson modes in random structures. If used as laser resonators, photonic quasi-crystals open up design possibilities that are simply not possible in a conventional periodic photonic crystal. In this letter, we exploit the concept of a 2D photonic quasi crystal in an electrically injected laser; specifically, we pattern the top surface of a terahertz quantum-cascade laser with a Penrose tiling of pentagonal rotational symmetry, reaching 0.1–0.2% wall-plug efficiencies and 65 mW peak output powers with characteristic surface-emitting conical beam profiles, result of the rich quasi-crystal Fourier spectrum.

Date: 2014
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DOI: 10.1038/ncomms6884

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