Acta Physica Sinica, Год журнала: 2024, Номер 74(3), С. 0 - 0

Опубликована: Дек. 23, 2024

This study introduces a tunable perfect absorber in the terahertz range based on Dirac semimetal nanowires, featuring high sensitivity, quality factor, and dual functionality. The achieves absorption across seven bands within of 0 - 14.5 THz: f1=5.032 THz (84.43%), f2=5.859 (96.23%), f3=7.674 (91.36%), f4=9.654 (99.02%), f5=11.656 (93.84%), f6=12.514 (98.47%), f7=14.01 (97.32%). To ensure structural stability during design, periodicity wire array structure was carefully considered. Verification absorber's performance conducted through impedance matching calculations. Analysis surface electric magnetic fields at resonance frequencies elucidates underlying physical mechanisms governing characteristics. Quality factors (Q) for points were computed, with maximum Q 219.41 observed. Further investigations by varying external refractive index reveal sensitivity figure merit (FOM) values 5421.43 (GHz/RIU) 35.204 (1/RIU), respectively. Then, discussing influence key parameters device, we conclude that device can achieve choice fixed performance. Dynamic modulation capabilities demonstrated semimetal's Fermi energy (BDS). Additionally, examination device's angle incidence dependence highlighted stable mid-low frequency but cautioned about high-frequency range, necessitating careful consideration practical applications. In conclusion, proposed holds significant promise imaging, sensing, detection applications, offering valuable insights optoelectronic design.

Язык: Английский