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Konnikova MR, Khomenko MD, Tverjanovich AS, Bereznev S, Mankova AA, Parashchuk OD, Vasilevsky IS, Ozheredov IA, Shkurinov AP, Bychkov EA. GeTe 2 Phase Change Material for Terahertz Devices with Reconfigurable Functionalities Using Optical Activation. ACS Appl Mater Interfaces 2023; 15:9638-9648. [PMID: 36780579 DOI: 10.1021/acsami.2c21678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The phenomenon of phase change transition has been a fascinating research subject over decades due to a possibility of dynamically controlled materials properties, allowing the creation of optical devices with unique features. The present paper unravels the optical characteristics and terahertz (THz) dielectric permittivity of a novel phase change material (PCM), GeTe2, prepared by pulsed laser deposition (PLD) and their remarkable contrast in crystalline and amorphous states, in particular, a difference of 7 orders of magnitude in conductivity. The THz spectra were analyzed using the harmonic oscillator and Drude term. Using GeTe2 PLD films, we designed and prepared a THz metasurface in the form of periodic structure and revealed a possibility of tuning the THz resonance either by a thermal control or light-induced crystallization response, thus achieving the dynamic and tunable functionality of the metastructure. We propose controlling the state of metasurface by observing the intensity characteristics of the Raman peak of 155 cm-1. Density functional theory (DFT) modeling demonstrates that in the process of crystallization the mode intensity of 155 cm-1 assigned to Te-Te stretching in amorphous chain fragments decreases and disappears at full crystallization.
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Affiliation(s)
- Maria R Konnikova
- Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia
- ILIT RAS-Branch of the FSRC "Crystallography and Photonics", RAS, 140700 Shatura, Moscow Region, Russia
- Laboratory of Biophotonics, National Research Tomsk State University, 634050, Tomsk, Russia
| | - Maxim D Khomenko
- ILIT RAS-Branch of the FSRC "Crystallography and Photonics", RAS, 140700 Shatura, Moscow Region, Russia
| | - Andrey S Tverjanovich
- Institute of Chemistry, St. Petersburg State University, 198504 St. Petersburg, Russia
| | - Sergei Bereznev
- Department of Materials and Environmental Technology, Tallinn University of Technology, 19086 Tallinn, Estonia
| | - Anna A Mankova
- Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia
| | - Olga D Parashchuk
- Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia
| | - Ivan S Vasilevsky
- National Research Nuclear University MEPhI, Kashirskoe sh. 31, 115409 Moscow, Russia
| | - Ilya A Ozheredov
- Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia
- ILIT RAS-Branch of the FSRC "Crystallography and Photonics", RAS, 140700 Shatura, Moscow Region, Russia
| | - Alexander P Shkurinov
- Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia
- Laboratory of Biophotonics, National Research Tomsk State University, 634050, Tomsk, Russia
| | - Eugene A Bychkov
- ILIT RAS-Branch of the FSRC "Crystallography and Photonics", RAS, 140700 Shatura, Moscow Region, Russia
- Laboratoire de Physico-Chimie de l'Atmosphère, Université du Littoral Côte d'Opale, 59140 Dunkerque, France
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