Multi-channel Si-liquid crystal filter with fine tuning capability of individual channels for compensation of fabrication tolerances.
In this study, a technique for the optimization of the optical characteristics of multi-channel filters after fabrication is proposed. The multi-channel filter under consideration is based on a Si photonic crystal (PhC), tunable liquid crystal and opto-fluidic technologies. By filling air grooves in the one-dimensional, Si-Air PhC with a nematic liquid crystal, an efficiently coupled multi-channel filter can be realised in which a wide stop band is used for channel separation over a wide frequency range. By selectively tuning the refractive index in various coupled cavities, continuous individual tuning of the central channel (or edge channels) up to 25% of the total channel spacing is demonstrated. To our knowledge, this is the first report on the electro-optical solution for the compensation of fabrication tolerances in an integrated platform.
Department of Electronic and Electrical Engineering, Trinity College Dublin, College Green, Dublin 2, Ireland. baldycha@tcd.ie.
Anna
A
Baldycheva
Vladimir A
VA
Tolmachev
Kevin
K
Berwick
Tatiana S
TS
Perova