Volume 115, Number 6, September 2016
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||26 October 2016|
Spoof surface whispering-gallery mode supported by two concentrically coupled textured ring resonators
Wireless Innovation Lab of Yunnan University, School of Information Science and Engineering, Yunnan University - Kunming, Yunnan, China
Received: 16 September 2016
Accepted: 11 October 2016
The Whispering-Gallery Mode (WGM) is very useful for sensing applications due to the exposure of an evanescent field. In a previous work we have shown that a surface WGM can be excited at the exterior of a negative-permittivity or -permeability material layer attached to a dielectric microresonator, which can amplify the evanescent field and then further advance the sensitivity. In this paper a wheel-shaped resonator which consists of two concentrically coupled textured rings is designed to generate the surface WGM and a sensor prototype is fabricated. The results show that the coupling gap between the two textured rings has provided a new freedom to manipulate the resonant characteristic and field confinement effect. Since most energies are concentrated in the vicinity of the gap, this region is quite sensitive to a slight change in the sample substance. Experimental results at the microwave frequencies are consistent with simulation and verify the performances of the sensor.
PACS: 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) / 78.67.Pt – Multilayers; superlattices; photonic structures; metamaterials / 04.30.Nk – Wave propagation and interactions
© EPLA, 2016
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