Gap Shear Waves in Quasi PT-Symmetric Piezoelectric Heterostructure Near the Point of Mode Generation

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Аннотация

The propagation of slit shear waves in the quasi-symmetric structure of piezoelectrics of the 4mm symmetry class has been theoretically investigated. It has been shown that taking into account the unequal level of losses and amplification in piezoelectrics leads in the shear wave spectrum either to an intersection, or to a touch, or to a convergence of two modes at the point of their degeneracy (singular point). It is established that the intersection of the mode spectra occurs only in the case of equal loss and gain values (PT is a symmetric structure). Based on this, it is concluded that by the nature of the spectra near a singular point, it is possible to determine the level of imbalance of gain and loss in piezoelectric waveguides. As in the case of a purely PT-symmetric structure, the frequency dependence of the amplitude at an exceptional point of a quasi PT-symmetric structure (with a fairly small difference in loss and gain levels) has a very narrow peak, which opens up the possibility of creating hypersensitive sensors based on them. Thus, it is demonstrated that even with unequal levels of loss and gain in piezoelectrics (quasi PT-symmetric structure), it is possible to obtain a structure with all the properties of a PT-symmetric structure.

Толық мәтін

Рұқсат жабық

Авторлар туралы

E. Vilkov

Fryazino Branch of the V.A. Kotelnikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: e-vilkov@yandex.ru
Ресей, Fryazino

O. Byshevsky-Konopko

Fryazino Branch of the V.A. Kotelnikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences

Email: e-vilkov@yandex.ru
Ресей, Fryazino

D. Kalyabin

V.A. Kotelnikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences; Moscow Institute of Physics and Technology

Email: e-vilkov@yandex.ru
Ресей, Moscow; Dolgoprudny

S. Nikitov

V.A. Kotelnikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences; Moscow Institute of Physics and Technology; Saratov State University

Email: e-vilkov@yandex.ru
Ресей, Moscow; Dolgoprudny; Saratov

Әдебиет тізімі

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2. Fig. 1. Schematic of the problem. Letters A, S denote antisymmetric and symmetric modes

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3. Fig. 2. Spectrum of slit electroacoustic wave modes for two identical 4mm class piezocrystals in the absence of attenuation and amplification

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4. Fig. 3. Spectra of electroacoustic wave modes for two identical 4mm class piezocrystals separated by a gap (h = 10-5 cm): (a) - BaTiO3, (b) - Ba2Si2TiO8. The figures indicate the spectra of ‘symmetric’ (thickened curve) and ‘antisymmetric’ modes (thin curve) for different attenuation and amplification levels: 1 - , 2 - , 3 -

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5. Fig. 4. Dependence of electric potential amplitude difference Φ0 in the gap at y = ±h on the value

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6. Fig. 5. Full potential modulus profile for the two modes when . The calculated parameters correspond to Fig. 3б. (a) - k = 24500 cm-1, (b) - k = 38761 cm-1, (c) - k = 49200 cm-1

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7. Fig. 6. Dependences of electric potential amplitudes of ‘symmetric’ (thickened curve) and ‘antisymmetric’ (thin curve) modes at y = 0 on frequency for: (a) - , (b) - , (c) -

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