Abstract
Nanoscale metallic barriers embedded in terahertz (THz) slot antennas are shown to provide unprecedented control of the transition state arising at the crossover between the full- and half-wavelength resonant modes of such antennas. We demonstrate strong near-field coupling between two paired THz slot antennas separated by a 5 nm wide nanobarrier, almost fully inducing the shift to the resonance of the double-length slot antenna. This increases by a factor of 50 the length-scale needed to observe similar coupling strengths in conventional air-gap antennas (around 0.1 nm), making the transition state readily accessible to experiment. Our measurements are in good agreement with a quantitative theoretical modeling, which also provides a simple physical picture of our observations.
| Original language | English |
|---|---|
| Pages (from-to) | 8340-8345 |
| Number of pages | 6 |
| Journal | ACS nano |
| Volume | 5 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2011 Oct 25 |
Keywords
- nanoparticle detection
- paired antenna
- subskin depth barrier
- terahertz nano slot antenna
- terahertz spectroscopy
ASJC Scopus subject areas
- Materials Science(all)
- Engineering(all)
- Physics and Astronomy(all)