Transmitted spectral modulation of double-ring resonator using liquid crystals in terahertz range
2013
Metamaterials with subwavelength structural features show unique electromagnetic responses that are unattainable with
natural materials. Recent research on these artificial materials has been pushed forward to the terahertz region because of
potential applications in biological fingerprinting, security imaging, remote sensing, and high frequency magnetic and
electric resonant devices. Active control of their properties could further facilitate and open up new applications in terms
of modulation and switching. Liquid crystals, which have been the subject of research for more than a century, have the
unique properties for the development of many other optical components such as light valves, tunable filters and tunable
lenses. In this paper, we investigated the transmitted spectral modulation in terahertz range by using liquid crystals (5CB
and TEB300) covering on the fabricated double-ring resonators to realize the shift of the resonance frequency. Our
obtained results indicate the low frequency resonance shows the obvious blue-shift, while the location of high frequency
resonance is nearly unchanged. We believe this phenomenon is related to not only the refractive index of the covering
liquid crystals but also the resonant mechanism of both resonances.
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