Premium
Optically Pumped Broadband Terahertz Modulator Based on Nanostructured PtSe 2 Thin Films
Author(s) -
Jakhar Alka,
Kumar Prabhat,
Moudgil Akshay,
Dhyani Veerendra,
Das Samaresh
Publication year - 2020
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201901714
Subject(s) - materials science , terahertz radiation , optoelectronics , laser , thin film , optics , polarizer , raman spectroscopy , modulation (music) , nanotechnology , birefringence , philosophy , physics , aesthetics
Here, an optically pumped terahertz (THz) modulator based on the novel transition metal dichalcogenide (TMD) material platinum diselenide (PtSe 2 ) is demonstrated. The nanostructured PtSe 2 thin films are formed by direct selenization of the sputtered platinum film on a high‐resistivity silicon substrate. Raman spectroscopy, scanning electron microscopy, and high‐resolution transmission electron microscopy confirm the formation of polycrystalline PtSe 2 nanostructures. The transmission measurements reveal the modulation of the THz waves in the wide frequency range of 0.1–1 THz. The modulation depth of 32.7% is achieved under low pumping laser power of 1 W cm −2 . The numerical analysis based on the finite difference time domain method is in good agreement with the experimentally obtained results. Further, the simulation results manifest that higher modulation depth can be achieved with the utilization of higher laser power. This work provides a path for the application of TMD materials like PtSe 2 in the development of THz tunable devices such as modulators, polarizers, filters.