Tunable dual‐band filter based on monolayer black phosphorus

Abstract

We propose analytical and numerical modeling of a tunable electromagnetic dual‐band filter based on a periodic structure of black phosphorus (BP) discs deposited on silicon dioxide for operating in terahertz and infrared regions. Due to BP anisotropy, single operation dipole mode bands for polarization of incident wave in the armchair or zigzag directions exist. These bands correspond to different resonant frequencies. However, for another polarization, in particular, for a 4 5 ∘ $4{5}^{\circ }$ polarization, a double operation band appears. The dynamic control of the proposed structure can be performed by varying the electronic doping of the BP, thus changing the operating frequency of the filter. The analytical model based on the temporal coupled‐mode theory is in good agreement with the numerical simulations by COMSOL Multiphysics.

Photodetectors integrating waveguides and semiconductor materials

“…2D materials, including graphene, BP, and tungsten disulfide (WS 2 ), can be seamlessly integrated with waveguides without significantly affecting the mode fields. 51,52,69 Moreover, graphene materials can be transferred to any substrate without considering lattice mismatch. 70 Simultaneously, the transferred graphene can maintain its excellent electron transport properties.…”

“…Since the first successful exfoliation of graphene in 2004, 50 two-dimensional (2D) semiconductor materials have attracted increasing attention in photoelectric detection due to their unique structure and physical properties. Currently, some 2D materials have been used in the field of waveguide photodetectors, including graphene, 51 BP, 52 MoTe 2 , 53 and carbon nanotubes. 54 Further, 2D materials can be conveniently transferred to the waveguide substrate via the wet transfer or dry transfer process.…”

Broadband terahertz absorber based on the coupling between Au and graphene

“…Subsequently, various metamaterial absorbers 12 , 13 have been designed by adjusting the shapes or components of the metamaterial. The dual band, 14 , 15 triple band, 16 , 17 multi band, 18 , 19 broadband, 20 , 21 and tunable absorption 22 , 23 can gradually be achieved. Broadband and tunable absorbers are particularly useful in applications that require broadband sensing and detection.…”