Abstract
We examine arrays of metal-mesh frameworks for their wide-band absorption. These take the form of quasi-crystal optical cages. While there are many plasmonic structures that exhibit lossy behavior, they tend to be narrow band. By defining a quality loss metric, L = A/Q, where A is the absorption coefficient and Q is the quality factor, we are able to show that all absorbers fall in the range L:[0,2]. Metastructures have L∼0.04 while in our case L∼0.35. An array of cages tends to concentrate the incoming radiation within each framework. An array of cage-within-cage funnels the radiation from the outer cage to its inner core even further raising the possibility for new applications. We report on two surprising outcomes: copper based frameworks are better than silver based, and larger cage opening (thinner wires) are more effective than smaller openings (thicker wires).
Original language | English (US) |
---|---|
Article number | 100008 |
Journal | Optical Materials: X |
Volume | 1 |
DOIs | |
State | Published - Jan 2019 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering
- Spectroscopy
- Inorganic Chemistry
- Physical and Theoretical Chemistry
- Organic Chemistry