TAILIEUCHUNG - composite 2012 Part 3

Tham khảo tài liệu 'composite 2012 part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Liquid Crystals into Planar Photonic Crystals 33 the value nhoic for both polarizations thus confirming that at T 40 C the infiltrated LCs are in their isotropic phase. The same result is obtained by the 2D-FDTD fit of the resonance energy in the transmission spectrum through the FP cavities. The infiltration efficiency is defined as the percentage of the PhC slab that is filled . n nhoie - 1 nLC -1 . Since nLC ni see Fig. 7 in Sect. the value n is obtained. We remark that whilst the same value is obtained for several hole diameters n does not contain any local information on the partial or complete filling of individual holes. Optical characterization of the molecule orientation Once the infiltration efficiency is known in order to identify the better mechanisms to tune the optical properties of the infiltrated PhCs it is important to understand how the nematic LC molecules organize inside the PhC holes. The configuration of the LC director field inside cylindrical capillaries can be indeed numerically obtained by minimizing the total energy of the LCs in contact with the cylinder surface. The molecule anchoring to the lateral surfaces as well as for nanometer-size tubes the balance between the elastic and the surface forces but also the LC properties . the LC elastic modulus the cavity geometry and the sidewall surface . its physical-chemical properties primarily determine the exact molecule orientation Burylov 1991 Crawford et al. 1991a-c Crawford Zumer 1996 . Several equilibrium configurations are possible On one hand if the anchoring is homeotropic according to the cylinder diameter and the anchoring force the planar radial planar polar or escaped radial configurations can be obtained see Fig. 13a-c . On the other hand in the case of a circular anchoring the planar circular the circular planar polar or the escaped circular configurations are privileged see Fig. 13d-f . Fig. 13. Examples of liquid crystals director .

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