Terahertz metamaterial perfect absorber with continuously tunable air spacer layer
Abstract
We present a comprehensive investigation of a continuously tunable metamaterial perfect absorber operating at terahertz frequencies. In particular, we investigate a three-layer absorber structure consisting of a layer of split ring resonators and a metallic ground plane, with a central layer consisting of a mechanically tunable air-spaced layer. The absorber was characterized using terahertz time-domain spectroscopy in reflection (at normal incidence) as a function of spacer thickness from 0 to 1000 μm. Our experimental measurements reveal the detailed evolution of the absorption bands as a function of spacing, in excellent agreement with analysis using interference theory and simulation. Our Fabry-Pérot-like structure provides an avenue for achieving massive tunability in metamaterial absorber devices.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 06, 2018
- Source ID
- 10.1063/1.5041282
Entities
People
- Guangwu Duan
- Jacob Schalch
- Richard D. Averitt
- Xiaoguang Zhao
- Xin Zhang
Organizations
- Army Research Office
- Boston University
- Center for Hierarchical Manufacturing
- University of California