Abstract
We demonstrate a compact multi-resonant metamaterial structure based on integrated U- and T-shaped nano-aperture antennas. We investigate the physical origin of the multi-resonant behavior and determine the parameter dependence of the nano-aperture antennas both experimentally and numerically. We also show enhanced field distribution in the apertures at the corresponding resonance wavelengths. Both multi-spectral response and enhanced near field distributions can open up exciting new opportunities in applications ranging from subwavelength optics and optoelectronics to chemical and biosensing.
Highlights
Metamaterials have gained tremendous interest over the past few years due to their unusual electromagnetic properties, which can be useful for negative refractive index materials, perfect lensing, bio-sensing, and invisibility cloaking [1,2,3,4]
We demonstrate a compact multi-resonant metamaterial structure based on integrated U- and T-shaped nano-aperture antennas
We investigate the physical origin of the multi-resonant behavior and determine the parameter dependence of the nano-aperture antennas both experimentally and numerically
Summary
Metamaterials have gained tremendous interest over the past few years due to their unusual electromagnetic properties, which can be useful for negative refractive index materials, perfect lensing, bio-sensing, and invisibility cloaking [1,2,3,4]. A microwave dualband negative-index metamaterial was fabricated [9] and experimentally confirmed as a multi-frequency resonator [10]. Near-IR metamaterials with dual-band negativeindex characteristics were reported [11,12]. Obtaining such unique electromagnetic responses require investigation of novel metamaterial designs. We investigate the spectral response of this novel metamaterial antenna both numerically and experimentally. We experimentally investigate the spectral responses of the individual U- and Tshaped nano-aperture antennas and compare the experimental results with the numerical analysis. Due to the multi-spectral response and enhanced near field distributions, the proposed antennas can be useful for wide range of applications. Multiple resonant bands can be important for wavelength-tunable filters as well as for advanced optical modulators and ultrafast switches operating at multiple wavelengths
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