Slow Wave Enhanced Antennas at RF and Optical Frequencies
Abstract
During the course of this grant, novel structures of antennas enhanced with slow waves was studied. The goal of this research is to improve the performance and reduce the size of an antenna at RF frequencies by using metamaterial-based slow wave, and to develop highly-sensitive optical sensors by utilizing a combination of slow wave and optical nano-antennas. The following results were obtained: 1. A cavity with double nanobeams structure has been designed and the slow light mode has been identified at the cut-off wavelength of a band structure with nearly flat (k) dispersion. The cavity has been fabricated successfully and its performance as a high resolution sensor has been characterized. 2. By introducing complementary split ring resonators (CSRR), complementary electric-LC resonators (CELC), or DGSs (defected ground structure), we have designed slow wave antennas to miniaturize the size of the antenna. 3. Micro-Ring-Resonator (MRR) with slow light effect has been designed and fabricated. The resonant wavelength shifts according to the concentration of the glucose solution flowing above the sensor region. 4. A nano-cavity antenna placed a certain distance away from the input surface of a nano-slit aperture milled in a metal film has been found to be able to greatly enhance the light transmission efficiency. 5. We have observed and studied some interesting phenomena associated with nearly zero index, which usually has an implication of slow group velocity (or very large phase velocity). For example, we have squeezed electromagnetic energy by using a dielectric split ring inside a permeability-near-zero metamaterial.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 21, 2010
- Accession Number
- ADA524812
Entities
People
- Sailing He
Organizations
- Royal Institute of Technology