Experimental realization of an open cavity.

Sailing He,Xiaochen Ge

doi:10.1038/srep05965

Sailing He, Xiaochen Ge

Open Access

https://doi.org/10.1038/srep05965

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Abstract

Highlights

The design and experimental demonstration of an open cavity in the microwave region is presented
A triangular lattice of hexagonal holes drilled on a perfect metal surface is used as the positive index material
It can be seen that the second band is pulled down by the presence of the dielectric structure and overlaps with the first band of the positive index material at the normalized frequency around 0.4 c/a (c is the speed of light in vacuum.)

Summary

Experimental realization of an open cavity

The design and experimental demonstration of an open cavity in the microwave region is presented. The resonance condition is achieved through the cancellation of lightpaths in positive and negative refractive index materials. The positive index material is a structured aluminium surface supporting a spoof surface plasmon mode, and the negative index material is a photonic crystal made of alumina. One particular application for photonic crystals with a negative effective index is an open cavity, a cavity without reflecting walls. In a ray-tracing view, the resonant condition is achieved by arranging alternating positive-index and negative-index material wedges with minimal interface-reflection so that the positive and negative lightpaths cancel each other out and form an open cavity with high quality factor[8,9,10,11]. We will experimentally demonstrate a microwave open cavity with a hybrid of photonic crystal and spoof plasmon structure

Results

Discussion

Methods

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