Wang Yiqu, Xie Haohan, Liu Rong, Dong Jun
School of Physics and Electronics, Hunan University, Changsha 410082, China.
College of Information Science and Engineering, Hunan Normal University, Changsha 410081, China.
Sensors (Basel). 2025 Jun 10;25(12):3644. doi: 10.3390/s25123644.
This academic paper proposes a terahertz (THz) device featuring dynamic adjustability. This device relies on composite metamaterials made of graphene and vanadium dioxide (). By integrating the electrically adjustable traits of graphene with the phase transition attributes of , the suggested metamaterial device can achieve both broadband absorption and dual-band linear-to-circular polarization conversion (LCPC) in the terahertz frequency range. When is in its metallic state and the Fermi level of graphene is set to zero electron volts (eV), the device shows remarkable broadband absorption. Specifically, it attains an absorption rate exceeding 90% within the frequency span of 2.28-3.73 terahertz (THz). Moreover, the device displays notable polarization insensitivity and high resistance to changes in the incident angle. Conversely, when shifts to its insulating state and the Fermi level of graphene stays at 0 eV, the device operates as a highly effective polarization converter. It attains the best dual-band linear-to-circular polarization conversion within the frequency ranges of 4.31-5.82 THz and 6.77-7.93 THz. Following the alteration of the Fermi level of graphene, the device demonstrated outstanding adjustability. The designed multi-functional device features a simple structure and holds significant application potential in terahertz technologies, including cloaking technology, reflectors, and spatial modulators.
这篇学术论文提出了一种具有动态可调性的太赫兹（THz）器件。该器件基于由石墨烯和二氧化钒制成的复合超材料。通过将石墨烯的电可调特性与二氧化钒的相变特性相结合，所提出的超材料器件能够在太赫兹频率范围内实现宽带吸收和双波段线性到圆偏振转换（LCPC）。当二氧化钒处于金属态且石墨烯的费米能级设置为零电子伏特（eV）时，该器件表现出显著的宽带吸收。具体而言，在2.28 - 3.73太赫兹（THz）的频率范围内，其吸收率超过90%。此外，该器件还表现出显著的偏振不敏感性以及对入射角变化的高抗性。相反，当二氧化钒转变为绝缘态且石墨烯的费米能级保持在0 eV时，该器件作为高效的偏振转换器工作。它在4.31 - 5.82 THz和6.77 - 7.93 THz的频率范围内实现最佳的双波段线性到圆偏振转换。随着石墨烯费米能级的改变，该器件展现出出色的可调性。所设计的多功能器件结构简单，在太赫兹技术中，包括隐身技术、反射器和空间调制器等方面具有重要的应用潜力。
