Broadband Optical Properties of Atomically Thin PtS2 and PtSe2

Nanomaterials

Aleksandr S. Slavich¹  Aleksey V. Arsenin¹  Dmitry I. Yakubovsky¹  Valentyn S. Volkov¹  Kirill V. Voronin¹  Andrey A. Vyshnevyy¹  Arslan B. Mazitov¹  Mikhail S. Mironov¹  Andrey M. Markeev¹  Mikhail K. Tatmyshevskiy¹  Sergey M. Novikov¹  Ivan A. Kruglov¹  Georgy A. Ermolaev¹  Andrey P. Tselin¹  Roman I. Romanov² 

[1] Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, 141700 Dolgoprudny, Russia;Moscow Engineering Physics Institute, National Research Nuclear University MEPhI, 31 Kashirskoe Sh., 115409 Moscow, Russia;

关键词: transition metal dichalcogenides;    two-dimensional materials;    optical constants;    dielectric properties;    refractive index;    nano-photonics;   

DOI  :  10.3390/nano11123269

来源: DOAJ

【 摘 要 】

Noble transition metal dichalcogenides (TMDCs) such as PtS₂ and PtSe₂ show significant potential in a wide range of optoelectronic and photonic applications. Noble TMDCs, unlike standard TMDCs such as MoS₂ and WS₂, operate in the ultrawide spectral range from ultraviolet to mid-infrared wavelengths; however, their properties remain largely unexplored. Here, we measured the broadband (245–3300 nm) optical constants of ultrathin PtS₂ and PtSe₂ films to eliminate this gap and provide a foundation for optoelectronic device simulation. We discovered their broadband absorption and high refractive index both theoretically and experimentally. Based on first-principle calculations, we also predicted their giant out-of-plane optical anisotropy for monocrystals. As a practical illustration of the obtained optical properties, we demonstrated surface plasmon resonance biosensors with PtS₂ or PtSe₂ functional layers, which dramatically improves sensor sensitivity by 60 and 30%, respectively.

【 授权许可】

Unknown