najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2026-17-2-193-199najo-1760Research ArticlePHYSICSФИЗИКАDispersion analysis and tunable magnetic properties of a biaxial hyperbolic metamaterial based on n-GaAs/AlGaAs heterostructuresДисперсионный анализ и регулируемые магнитные свойства двуосного гиперболического метаматериала на основе гетероструктур n-GaAs/AlGaAshttps://orcid.org/0009-0009-4001-4873НгуенФам Куинь АньNguyenPham Quynh Anh

Nguyen Pham Quynh Anh 

273 An Duong Vuong Street, Cho Quan Ward, Ho Chi Minh City 

npqanh@sgu.edu.vnFaculty of Engineering and Technology, Saigon UniversityViet Nam202630042026172193199Copyright © Nguyen P., 20262026Нгуен Ф.Nguyen P.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/1760

This study presents the design and theoretical analysis of a tunable biaxial hyperbolic metamaterial (BHMM) constructed from a layered n-GaAs/AlGaAs heterostructure under an external magnetic field. The objective is to optimize the tunability in order to control the dispersion shape for applications in the terahertz (THz) frequency regime. The effective medium approximation (EMA) model is employed and demonstrates the coexistence of two wave modes, namely, a closed ellipsoidal and an open hyperboloidal isofrequency surface. The results reveal that the external magnetic field acts as a powerful tuning mechanism, enabling spectral shifting of the dispersion and active switching between Type-I and Type-II hyperbolic regimes. In addition, the conditions required to achieve extreme compression of the isofrequency surface (IFS), which is essential for beam steering control, are analyzed. This compression occurs when one component of the permittivity reaches extremely large values, leading to the formation of near-flat segments on the isofrequency surface.

В данном исследовании представлены проектирование и теоретический анализ перестраиваемого двуосного гиперболического метаматериала (БГММ), построенного из слоистой гетероструктуры n-GaAs/AlGaAs под воздействием внешнего магнитного поля. Цель состоит в оптимизации перестраиваемости для управления формой дисперсии в терагерцовом (ТГц) диапазоне частот. Используется модель приближения эффективной среды (ПЭС), демонстрирующая сосуществование двух волновых мод, а именно замкнутой эллипсоидальной и открытой гиперболоидальной изочастотной поверхности. Результаты показывают, что внешнее магнитное поле действует как мощный механизм настройки, позволяющий осуществлять спектральный сдвиг дисперсии и активное переключение между гиперболическими режимами типа I и типа II. Кроме того, анализируются условия, необходимые для достижения экстремального сжатия изочастотной поверхности (ИЗП), что имеет важное значение для управления направлением луча. Это сжатие происходит, когда одна из компонент диэлектрической проницаемости достигает чрезвычайно больших значений, что приводит к образованию почти плоских сегментов на изочастотной поверхности

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The authors declare that there are no conflicts of interest present.