GeTe2 Phase Change Material for Terahertz Devices with Reconfigurable Functionalities Using Optical Activation

Konnikova, M.R.; Khomenko, M.D.; Tverjanovich, A.S.; Bereznev, S.; Mankova, A.A.; Parashchuk, O.D.; Vasilevsky, I.S.; Ozheredov, I.A.; Shkurinov, A.P.; Bychkov, E.A.

Авторы: Konnikova Maria R., Khomenko Maxim D., Tverjanovich Andrey S., Bereznev Sergei, Mankova Anna A., Parashchuk Olga D., Vasilevsky Ivan S., Ozheredov Ilya A., Shkurinov Alexander P., Bychkov Eugene A.
Журнал: ACS applied materials & interfaces
Год издания: 2023
Издательство: American Chemical Society
Местоположение издательства: United States
DOI: 10.1021/acsami.2c21678
Аннотация: 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.
Добавил в систему: Конникова Мария Руслановна

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GeTe2 Phase Change Material for Terahertz Devices with Reconfigurable Functionalities Using Optical Activationстатья

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