Journal of the European Optical Society - Rapid publications, Vol 1 (2006)

Electrically tunable, ultranarrowband, circular-polarization rejection filters with electro-optic structurally chiral materials

A. Lakhtakia


The transmittance spectrum of a slab of an electro--optic structurally chiral material (SCM) that is helicoidally
nonhomogeneous in the thickness direction and is endowed
with a central 90$^\circ$--twist defect, shows evidence of an ultranarrowband spectral hole when a sufficiently high dc electric field is applied between the entry and the exit planes and the incident light is circularly polarized in opposition to the structural handedness of the SCM. This spectral hole migrates on the wavelength axis as the applied dc electric field is altered in magnitude, thereby suggesting the possible use of a centrally defective, electro-optic SCM slab as an electrically tunable, circular-polarization rejection filter with ultranarrow bandwidth.

© The Authors. All rights reserved. [DOI: 10.2971/jeos.2006.06006]

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W.H. Southwell, "Spectral response calculations of rugate filters using coupled-wave theory" J. Opt. Soc. Am. A 5, 1558-1564 (1988).

H.A. Macleod, Thin-film optical filters (Institute of Physics, Bristol, United Kingdom, 2001).

H.A. Haus and C.V. Shank, "Asymmetric taper of distributed feedback lasers" IEEE J. Quantum. Electron. 12, 532-539 (1976).

G.P. Agrawal and S. Radic, "Phase-shifted fiber Bragg gratings and their application for wavelength demultiplexing" IEEE Photon Technol. Lett. 6, 995-997 (1994).

S. Chandrasekhar, Liquid crystals (Cambridge University Press, Cambridge, United Kingdom, 1992).

P.G. de Gennes and J. Prost, The physics of liquid crystals (Clarendon Press, Oxford, United Kingdom, 1993).

A. Lakhtakia and R. Messier, Sculptured thin films: Nanoengineered morphology and optics (SPIE Press, Bellingham, WA, USA, 2005).

Y.-C. Yang, C.-S. Kee, J.-E. Kim, H.Y. Park, J.-C. Lee and Y.-J. Jeon, "Photonic defect modes of cholesteric liquid crystals" Phys. Rev. E 60, 6852-6854 (1999).

A. Lakhtakia and M. McCall, "Sculptured thin films as ultranarrowbandpass circular-polarization filters" Opt. Commun. 168, 457-465 (1999).

I.J. Hodgkinson, Q.H. Wu, K.E. Thorn, A. Lakhtakia and M.W. McCall, "Spacerless circular-polarization spectral-hole filters using chiral sculptured thin films: theory and experiment" Opt. Commun. 184, 57-66 (2000).

A. Lakhtakia, M.W. McCall, J.A. Sherwin, Q.H. Wu and I.J. Hodgkinson, "Sculptured-thin-film spectral holes for optical sensing of fluids" Opt. Commun. 194, 33-46 (2001).

F. Wang and A. Lakhtakia, "Specular and nonspecular, thicknessdependent spectral holes in a slanted chiral sculptured thin film with a central twist defect" Opt. Commun. 215, 79-92 (2003).

I.J. Hodgkinson, Q.h. Wu, L. De Silva, M. Arnold, M.W. McCall and A. Lakhtakia, "Supermodes of chiral photonic filters with combined twist and layer defects" Phys. Rev. Lett. 91, 223903 (2003).

M. Becchi, S. Ponti, J.A. Reyes and C. Oldano, "Defect mode in helical photonic crystals: An analytic approach" Phys. Rev. A 70, 033103 (2004).

J. Schmidtke and W. Stille, "Photonic defect modes in cholesteric liquid crystal films" Eur. Phys. J. E. 12, 553-564 (2003).

F. Wang and A. Lakhtakia, "Optical crossover phenomenon due to a central 90

-twist defect in a chiral sculptured thin film or chiral liquid crystal" Proc. R. Soc. Lond. A 461, 2985-3004 (2005).

F. Wang and A. Lakhtakia, "Defect modes in multisection helical photonic crystals" Opt. Express 13, 7319-7335 (2005).

C.G. Avendao, S.Ponti, J.A. Reyes and C.Oldano, "Multiplet structure of the defect modes in 1D helical photonic crystals with twist defects" J. Phys. A: Math. Gen. 38, 8821-8840 (2005).

J. Schmidtke, W. Stille and H. Finkelmann, "Defect mode emission of a dye-doped cholesteric polymer network" Phys. Rev. Lett. 90, 083902 (2003).

J. Xu, A. Lakhtakia, J. Liou, A. Chen and I.J. Hodgkinson, "Circularly polarized fluorescence from light-emitting microcavities with sculptured-thin-film chiral reflectors", Opt. Commun. accepted for publication.

A. Lakhtakia and J. Xu, "Planewave remittances of an axially excited chiral sculptured thin film with gain" Optik accepted for publication.

R.W. Boyd, Nonlinear optics (Academic Press, San Diego, CA, USA, 1992).

A. Lakhtakia, "Narrowband and ultranarrowband filters with electro-optic structurally chiral materials" Asian J. Phys. accepted for publication; also: .

I.J. Hodgkinson, Q.h. Wu, L. De Silva, M. Arnold, M.W. McCall and A. Lakhtakia, "Supermodes of chiral photonic filters with combined twist and layer defects", Phys. Rev. Lett. 91, 223903 (2003).

F. Wang and A. Lakhtakia, "Third method for generation of spectral holes in chiral sculptured thin films" Opt. Commun. 250, 105-110 (2005).

A. Lakhtakia, "Generalized Oseen transformation for and enhancement of Bragg characteristics of electro-optic structurally chiral materials" Opt. Commun. 261, 213-217 (2006).

W.R. Cook Jr., Electrooptic coefficients, in: D.F. Nelson, Landolt- Bornstein Volume III/30A (Springer, Berlin, Germany, 1996).

A. Yariv and P. Yeh, Photonics: Optical electronics in modern communications (Oxford University Press, New York, NY, USA, 2007).