< back to main site

Publications

Better than Bragg: optimising the quality factor of resonators with aperiodic dielectric reflectors.

Breeze, J*; Oxborrow, M; Alford, N M* (2011) Better than Bragg: optimising the quality factor of resonators with aperiodic dielectric reflectors. Appl. Phys. Lett., 99 (11). 113515

Full text not available from this repository.

Abstract

Periodic dielectric structures, such as quarter-wave Bragg reflectors and photonic band-gap crystals, are used across the spectrum to guide and localise electromagnetic modes. In particular, they are key components of resonators, for which a goal is minimisation of losses such that the resonator quality factor, Q, is maximised. From microwave to optical frequencies, resonators incorporating such structures have demonstrated high Q-factors, but are limited predominantly by dielectric losses. Higher Q-factors are very desirable and could make novel devices feasible. In most designs of periodic reflector, the dielectric losses occur substantially in the first few layers of reflector. If one of the quarter-wave reflector components has a much lower loss tangent than the other, the asymmetry can be advantageously exploited. By departing from spatial periodicity, and by tuning the individual dimensions of the reflecting elements, we show how an order-of-magnitude improvements in the Q-factor can be achieved and demonstrate this with a proof-of-principle microwave resonator. These findings impact on the optimal design of the many important electromagnetic and quantum-optical devices whose performances depend on these factors.

Item Type: Article
Subjects: Quantum Phenomena
Quantum Phenomena > Nanophysics
Identification number/DOI: 10.1063/1.3639271
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5279

Actions (login required)

View Item View Item