Mr. Hasitha Arachchige Profile

Hasitha Arachchige

at Univ of Tennessee Knoxville

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Proceedings Article | 5 October 2023 Presentation

Enhancing second harmonic generation in Weyl semimetal TaAs with plasmonics

Alexandra Boltasseva, Morris Yang, Demid Sychev, Samuel Peana, Vahagn Mkhitaryan, David Mandurus, Hasitha Arachchige, Vladimir Shalaev

Proceedings Volume PC12648, PC1264801 (2023) https://doi.org/10.1117/12.2675918

KEYWORDS: Plasmonics, Second harmonic generation, Metalloids, Electrons, Nonlinear optics, Nanoantennas, Antennas, Terahertz radiation, Silver, Semiconductors

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Weyl semimetals (WSMs) is an emerging class of materials possessing unique electromagnetic properties that are not commonly achievable with conventional metals and semiconductors. The exotic phenomena emerging from the so-called Weyl nodes in WSMs where valence and conduction bands cross in single points and electrons effectively behave as Weyl fermions make WSMs very interesting for novel photonic applications in areas of non-linear optics, photovoltaics, THz electrooptics, and detection. In this work, we explore the enhancement of WSM nonlinear response by merging WSMs with the concept of plasmonics, i.e. nano-optics utilizing deeply subwavelength collective oscillations of free electrons in metallic nanostructures, and metasurfaces where arrays of plasmonic nanoantennas are used to control the phase, amplitude and polarization of the incident light. Since electrons possess non-trivial electronic states in WSMs, plasmonics could enable the observation of unique optoelectrical phenomena in WSMs with the added benefit of creating nonlinear optical elements that are smaller than the diffraction limit. Here, we realized a nanopatch plasmonic antenna array on the WSM TaAs crystal to demonstrate the enhanced non-linear optical response from TaAs. By developing a large-scale, non-destructive method of fabricating the antenna array, we address the challenge of WSM integration with photonic devices. We demonstrate a six-fold increase of the second-harmonic generation (SHG) from the Weyl semimetal TaAs surface by distributing plasmonic silver nanoantennas on TaAs.

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