Optically tunable narrowband filter using defect-induced pass-band in photonic crystal waveguide

Iida,; Omura,; Tsuji,

doi:10.1109/soi.2003.1242921

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…For example, PC-based tunable filters have attracted great interest in the past few years owing to their fast tuning response, low propagation loss and wide tuning range. To date, various approaches have been introduced to demonstrate the tunable function of PC filters such as the method based on thermo-optical effect, the method based on photo-induced refractive index change and the method based on the electro-optical effect [4][5][6][7][8]. Generally, the tuning range of the former two categories is small and thus difficult to meet the requirement of optical communication.…”

Section: Introductionmentioning

confidence: 99%

Tunable drop filters based on photonic crystal self-collimation ring resonators

Chen

et al. 2010

Optoelectronic Devices and Integration III

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A tunable drop filter (TDF) based on two-dimensional photonic crystal (PC) self-collimation ring resonator (SCRR) is proposed. The PC consisting of square-lattice air cylinders in silicon has square-shaped equal frequency contours (EFCs) in the wavevector space at the frequencies between 0.172-0.188c/a for TE modes. The SCRR includes two mirrors and two splitters. The air holes inside the SCRR are infiltrated with a kind of liquid crystal whose ordinary and extraordinary refractive indices are 1.522 and 1.706, respectively. The effective refractive index n eff of liquid crystal depends on the applied electric field. Simulated with the FDTD method, the transmission spectra at the drop port of SCRR are in the shape of sinusoidal curves with uniform peak spacing between 0.172-0.188c/a. Transmission peaks will shift to the lower frequencies when n eff is increased. When n eff changes from 1.522 to 1.706, the peaks will experience red-shift over 0.003c/a. So this SCRR can work as a tunable drop filter. For the operating wavelength around 1550nm, its dimensions are only tens of microns.

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