Amplification of high harmonics in 3D semiconductor waveguides
Abstract
Nanoscale amplification of non-linear processes in solid-state devices opens novel applications in nano-electronics, nano-medicine or high energy conversion for example. Coupling few nano-joules laser energy at a nanometer scale for strong field physics is demonstrated. We report enhancement of high harmonic generation in nano-structured semiconductors using nanoscale amplification of a mid-infrared laser in the sample rather than using large laser amplifier systems. Field amplification is achieved through light confinement in nano-structured semiconductor 3D waveguides. The high harmonic nano-converter consists of an array of zinc-oxide nanocones. They exhibit a large amplification volume, 6 orders of magnitude larger than previously reported and avoid melting observed in metallic plasmonic structures. The amplification of high harmonics is observed by coupling only 5-10 nano-joules of a 3.2 {\mu}m high repetition-rate OPCPA laser at the entrance of each nanocone. Harmonic amplification (factor 30) depends on the laser energy input, wavelength and nanocone geometry.
Cite
@article{arxiv.1709.09153,
title = {Amplification of high harmonics in 3D semiconductor waveguides},
author = {Dominik Franz and Rana Nicolas and Willem Boutu and Liping Shi and Quentin Ripault and Maria Kholodtsova and Bianca Iwan and Ugaitz Elu Etxano and Milutin Kovacev and Jens Biegert and Hamed Merdji},
journal= {arXiv preprint arXiv:1709.09153},
year = {2017}
}