Optical characteristics of ordinary and tunable 1D Si photonic crystals in the mid-infrared range

Vladimir Tolmachev; Tatiana Perova; Ekaterina Astrova; Jyulia Pilyugina; Alan Moore; Kevin Berwick

doi:10.1117/12.607252

3 June 2005 Optical characteristics of ordinary and tunable 1D Si photonic crystals in the mid-infrared range

Vladimir Tolmachev, Tatiana Perova, Ekaterina Astrova, Jyulia Pilyugina, Alan Moore, Kevin Berwick

Proceedings Volume 5825, Opto-Ireland 2005: Optoelectronics, Photonic Devices, and Optical Networks; (2005) https://doi.org/10.1117/12.607252
Event: OPTO-Ireland, 2005, Dublin, Ireland

Abstract

Reflection spectra and photonic band gaps (PBGs) for periodic structures consisting of grooved Si infiltrated with nematic liquid crystals (LCs) E7 have been obtained experimentally and by simulation. Periodically grooved Si matrixes, with lattice periods ranging from 2 to 6 μm, were fabricated using wet anisotropic etching of (110) Si in an alkaline solution. It is shown theoretically that a substantial shift of PBGs can be obtained when there is a homogeneous alignment of the liquid crystal molecules with respect to the Si walls and, therefore, a change in the LC's refractive index from n_o to n_e during elctro-tuning can be expected. This effect is smaller during thermo-tuning effect when refractive index changed from n_o to, n_i (isotropic LC phase). The simulated reflection spectra are in good agreement with experimental data obtained with a Digilab FTS 6000 FTIR spectrometer in conjunction with a UMA 500 infrared microscope. A shift of the PBG's edges by a factor Δλ/λ=7% was predicted as a result of a thermo-tuning effect and ~10% as a results of electro-tuning effect.

Citation Download Citation

Vladimir Tolmachev, Tatiana Perova, Ekaterina Astrova, Jyulia Pilyugina, Alan Moore, and Kevin Berwick "Optical characteristics of ordinary and tunable 1D Si photonic crystals in the mid-infrared range", Proc. SPIE 5825, Opto-Ireland 2005: Optoelectronics, Photonic Devices, and Optical Networks, (3 June 2005); https://doi.org/10.1117/12.607252

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