Effect of Wood’s anomalies on the profile of extraordinary transmission spectra through metal periodic arrays of rectangular subwavelength holes with different aspect ratio

Abstract

The extraordinary transmission through silver film perforated with rectangular hole array with different aspect ratio was investigated. It was found that when the aspect ratio exceeded 7, the propagating surface plasmon polaritons (SPPs) transformed to localized resonance mode. The role of the Wood's anomaly on the shape of the transmission spectrum is investigated. By designing the rectangular hole arrays in a rectangular lattice, the Wood's anomaly can be shifted far apart from the transmission peak, the real localized resonance peak wavelength was identified and fitted well with the theoretical calculation using a simplified transmission-line model.

Anomalous transmission of terahertz wave through one-dimensional lamellar metallic grating

“…This result is consistent with the prediction by half-wavelength resonance quantitatively [21,22]. For our case, there is no cut-off wavelength (frequency) in 1D grating [29]. The measured frequency range in our setup is from 0.1 to 1.6 THz, and the amplitude transmission can reach a value of 77% at 0.2 THz.…”

Mode splitting transmission effect of surface wave excitation through a metal hole array

“…31 This expression generalizes the relationship between f sw and the incident angle h, where the resonant formula discussed in Refs. 11-13 is a special case (h50 6 ) of this equation.…”

Optimization of Optoelectronic Plasmonic Structures

“…Each spectrum contains a reflection dip together with an anti-resonance reflection peak on the high frequency side. The reflection dip arises from the plasmonic resonance at the (0, ±1) mode at the Au/GaAs interface, whereas the anti-resonance feature arises from Wood's anomaly [20,21]. Figure 2a shows the structures with different cross-hole lengths (L= 2.38, 2.6, and 3.0 μm) but the same period (P=4.37 μm) and hole width (W=0.66 μm).…”