Tunability of absorption with temperature in the terahertz regime based on photonic crystals containing graphene and defect InSb layers

A numerical study of dynamic tunability of perfect absorption with temperature in the visible region based on a nanostructure containing multilayer graphene

“…The absorption is higher than the results of Zhou [44]. The resonant frequencies of the PA bands are dynamically tunable with changes to the temperature of the graphene layers; however, this 300 tunability of PA is not a linear relationship as compared to the terahertz region [42]. For the wide incidence of TE-and TM-polarized light, the simulation results show that the bands of PA can be broadened more than six times with the increasing temperature of graphene as compared to the MDMDM structure.…”

“…When we continue to reduce the temperature to 200 K, the PA band blue-shifts again. The dynamic tunability of PA using temperature in the visible region is 135 not a completely linear relationship as compared to the terahertz region [42].…”

Tunable THz absorption in photonic crystal including graphene and metamaterial

“…So far, several researchers investigated the optical absorption of graphene-based structures. For example; Thongrattanasiri et al have shown that a single sheet of doped graphene, patterned into a periodic array of nano-disks exhibits 100% light absorption [3] The tunability of absorption with the temperature in the graphene layer investigated by Ghasempour [6]. Zhu et al have investigated the dielectric-graphene-metal groove-grating absorber and show that a high efficiency (95%) absorptive spectrum in near infrared range could be achieved by tuning the applied voltage on graphene [7].…”

Temperature‐mediated excitation of defect modes in a periodic structure at terahertz frequencies

“…The spectral position of the defect mode depends on the thickness and permittivity of the defect. Therefore, if the defect consists of a material whose permittivity changes with the temperature, neglecting the phenomenon of thermal expansion, the defect mode has a central frequency which is temperature dependent 24 …”

“…Therefore, if the defect consists of a material whose permittivity changes with the temperature, neglecting the phenomenon of thermal expansion, the defect mode has a central frequency which is temperature dependent. 24 The specifics of multilayer structures comprising the components made of the materials that have strong dispersion at terahertz have not yet been deeply investigated. This is due to a number of reasons including the difficulty of depositing layers with thicknesses appropriate to the terahertz range, lack of knowledge of the physical characteristics of materials such as the refractive index and the extinction coefficient, and the need to have negligible absorption.…”