Abstract
We studied the transmission of the electromagnetic waves through subwavelength slit arrays in terahertz (THz) and optical frequency regions, respectively. In the optical frequency regime, the influences of surface plasmon polaritons on the near-field distribution and on the far-field transmittance are discussed. The near-field electro-optic sampling technique combined with fast Fourier transformation is applied in measuring the THz near-field distribution in time and spectral domains. From these, we discuss the existence of highly confined surface waves in the perfect conductor regime (THz) in comparison with the finite conducting case (visible range) in metallic multi-slit arrays. Our studies provide an integrated view of surface plasmons in the optical regime, and surface-bound waves mimicking surface plasmons in the THz region.
Highlights
Transmission of electromagnetic waves through subwavelength slits and apertures pierced on a metal plate has continuously been investigated from the mid-twentieth century to due to its high potential for engineering applications as well as fundamental importance in optics
We studied the electromagnetic waves transmitted through multiple slit arrays in optical and THz frequency regimes, respectively
In the optical frequency regime where surface plasmon polaritons (SPP) can be generated on an air–metal interface, we investigated (i) the SPP generation efficiency as a function of the slit width, (ii) the position- and height-dependent spectra near the SPP resonance and (iii) THz near-field patterns verifying the existence of SPPlike surface-bound waves
Summary
Transmission of electromagnetic waves through subwavelength slits and apertures pierced on a metal plate has continuously been investigated from the mid-twentieth century to due to its high potential for engineering applications as well as fundamental importance in optics. The vector field mapping of light emanating from a single slit [40] and a near-field amplification in a transmission metallic grating at SPP resonance [41] were presented by using near-field scanning optical microscopy (NSOM) ([42] and the referrences therein) As another type of SPP generator, a tabletop plasmonic accelerator has been proposed [43]. Pendry et al proposed that surface modes showing a dispersion relation similar to SPP can be induced on the interface by perforating structures on a scale of subwavelength [45, 46], and the existence of these surface modes has been experimentally verified in microwaves [12] This plasmonic metamaterial has been suggested [47, 48] and been experimentally studied for one- [49]–[51] and two-dimensional periodic [52, 53] and random arrays of gratings [54] in the THz regime. Including spoof surface plasmons in the THz regime, our studies give a coherent view of surface plasmons over a wide frequency range from THz to optical frequencies
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
