Can I read Spectral Tuning of High‐Harmonic Generation with Resonance‐Gradient Metasurfaces on EtoBox?

Spectral Tuning of High‐Harmonic Generation with Resonance‐Gradient Metasurfaces by Piyush Jangid; Felix Ulrich Richter; Ming Lun Tseng; Ivan Sinev; Sergey Kruk; Hatice Altug; Yuri Kivshar is a Engineering article available to read on EtoBox.

What is Spectral Tuning of High‐Harmonic Generation with Resonance‐Gradient Metasurfaces about?

## Abstract High‐index dielectric subwavelength structures and metasurfaces are capable of enhancing light‐matter interaction by orders of magnitude via geometry‐dependent optical resonances. This enhancement, however, comes with a fundamental limitation of a narrow spectral range of operation in the vicinity of one or few resonant frequencies. Here we tackle this limitation and introduce an innovative and practical approach to achieve spectrally tunable enhancement of light‐matter interaction with resonant metasurfaces. We design and fabricate __resonance‐gradient metasurfaces__ with varying geometrical parameters that translate into resonant frequencies dependence on one of the coordinates of the metasurface. The metasurfaces are composed of bone‐like nanoresonators which are made of germanium, and they support high‐__Q__ optical resonances in the mid‐IR spectral range. We apply this general concept to observe the resonant enhancement of the 3^rd^ and 5^th^ harmonics generated from the gradient metasurfaces being used in conjunction with a tunable excitation laser to provide a wide spectral coverage of resonantly‐enhanced tunable generation of multiple optical harmonics. This art

Who reads Spectral Tuning of High‐Harmonic Generation with Resonance‐Gradient Metasurfaces?

Author

Piyush Jangid; Felix Ulrich Richter; Ming Lun Tseng; Ivan Sinev; Sergey Kruk; Hatice Altug; Yuri Kivshar

Publisher

Wiley

Published

2023

Field

Engineering (Physical Sciences)