Structural control of metamaterial oscillator strength and electric field enhancement at terahertz frequencies
Abstract
The design of artificial nonlinear materials requires control over internal resonant charge densities and local electric field distributions. We present a MM design with a structurally controllable oscillator strength and local electric field enhancement at terahertz frequencies. The MM consists of a split ring resonator (SRR) array stacked above an array of closed conducting rings. An in-plane, lateral shift of a half unit cell between the SRR and closed ring arrays results in an increase of the MM oscillator strength by a factor of 4 and a 40% change in the amplitude of the resonant electric field enhancement in the SRR capacitive gap. We use terahertz time-domain spectroscopy and numerical simulations to confirm our results. We show that the observed electromagnetic response in this MM is the result of image charges and currents induced in the closed rings by the SRR.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 25, 2014
- Source ID
- 10.1063/1.4894466
Entities
People
- A. C. Strikwerda
- G. R. Keiser
- H. R. Seren
- Richard D. Averitt
- Xiaoxuan Zhang
Organizations
- Air Force Office of Scientific Research
- Boston University
- Defense Threat Reduction Agency
- Division of Electrical, Communications & Cyber Systems
- Technical University of Denmark
- University of California, San Diego