Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9812143 | Thin Solid Films | 2005 | 6 Pages |
Abstract
An omnidirectional mirror, with a reflectance (R) of 99.5% for all angles of incidence and both polarisations, was designed from quasi-periodic dielectric stacks based on Fibonacci sequence (FS) by selecting appropriate materials for high and low refractive index layers. At RÂ =Â 99.5%, the initial omnidirectional spectral range was found to be from 1437 to 1618 nm, which covers completely the telecommunications wavelength region and the S, C and L bands of the erbium doped fiber amplifier gain region. The individual layers within the FS have the same physical thickness, thus having non quarter-wave optical thickness at the centre wavelength. Optimisation from the initial design can expand the omnidirectional spectral region at RÂ =Â 99.5%, as well as show a higher value of R over the initial omnidirectional spectral range. Deposition and characterisation of the mirror coating have taken place using microwave assisted direct current magnetron sputtering and various characterisation techniques.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
D. Lusk, F. Placido,