Terahertz Electromagnetic Wave Transmission through Random Arrays of Single Rectangular Holes and Slits in Thin Metallic Sheets

Abstract

We report on the observation of terahertz transparency in random arrays of the single rectangular holes and slits with the areal coverage of only 12%. The terahertz transparency occurs at the fundamental shape resonance of the rectangular holes and confirms the theoretical predictions of earlier works of García-Vidal et al. [Phys. Rev. Lett. 95, 103901 (2005)] on single rectangular holes and of Ruan and Qiu [Phys. Rev. Lett. 96, 233901 (2006)] on random arrays of holes.

Optimization of Optoelectronic Plasmonic Structures

“…3. This line only represents the fundamental LSR resonance of the crosshole, which can be interpreted as the TE 01 waveguide cutoff resonance of this hole [22]. Considering the fact that the metallic plate is sandwiched between air (ε air =1) and the GaAs dielectric layer, the LSR mode frequency f shape can be quantitatively estimated to be:…”

Active Terahertz Nanoantennas Based on VO2 Phase Transition

“…For the insulating VO 2 , a rectangular hole in a gold coating acts as a slot antenna at resonance that receives nearby electromagnetic waves and funnels them into the other side of the slot. [36][37][38][39][40] Therefore, the sample, when the VO 2 film is insulating, is essentially transparent to the incoming terahertz waves at resonance because the antenna is at an on state (Figure 1b). In stark contrast to the insulating state, when the film undergoes phase transition, the nano slot antenna no longer operates (off state), and therefore simple reflection occurs throughout the metallic part of the sample, leaving very small transmittance defined by the coverage.…”

Near field imaging of terahertz focusing onto rectangular apertures

“…In this sense, a well-designed aperture can be the most efficient way of focusing electromagnetic energy beyond diffraction limit [2], provided that a resonant condition for large near-field enhancement is met. This type of near-field focusing is implicit in many experiments, including far-field transparency [3,4] at the fundamental resonance [5][6][7]. Near-field enhancement [8] and focusing would be particularly desirable in the terahertz range where most tabletop laboratory sources are too weak to induce, for example, nonlinear effects or to detect single molecules [9][10][11].…”