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Proceedings Paper

Optical characteristics of ordinary and tunable 1D Si photonic crystals in the mid-infrared range
Author(s): Vladimir Tolmachev; Tatiana Perova; Ekaterina Astrova; Jyulia Pilyugina; Alan Moore; Kevin Berwick
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Paper 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 no to ne during elctro-tuning can be expected. This effect is smaller during thermo-tuning effect when refractive index changed from no to, ni (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.

Paper Details

Date Published: 3 June 2005
PDF: 10 pages
Proc. SPIE 5825, Opto-Ireland 2005: Optoelectronics, Photonic Devices, and Optical Networks, (3 June 2005); doi: 10.1117/12.607252
Show Author Affiliations
Vladimir Tolmachev, Univ. of Dublin, Trinity College (Ireland)
Ioffe Physico-Technical Institute (Russia)
Tatiana Perova, Univ. of Dublin, Trinity College (Ireland)
Ekaterina Astrova, Ioffe Physico-Technical Institute (Russia)
Jyulia Pilyugina, Ioffe Physico-Technical Institute (Russia)
Alan Moore, Univ. of Dublin, Trinity College (Ireland)
Kevin Berwick, Dublin Institute of Technology (Ireland)

Published in SPIE Proceedings Vol. 5825:
Opto-Ireland 2005: Optoelectronics, Photonic Devices, and Optical Networks
John Gerard McInerney; Harold S. Gamble; Gerald Farrell; David M. Denieffe; Padraig Hughes; R. Alan Moore; Liam Barry, Editor(s)

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