Abstract
Polarization characteristics of defect mode peaks in a one-dimensional (1D) photonic crystal (PC) with a nematic liquid crystal (NLC) defect layer have been investigated. Two different polarized defect modes are observed in a stop band. One group of defect modes is polarized along the long molecular axis of the NLC, whereas another group is polarized along its short axis. Polarizations of the defect modes can be tuned by field-induced in-plane reorientation of the NLC in the defect layer. The polarization properties of the 1D PC with the NLC defect layer is also investigated by the finite difference time domain (FDTD) simulation.
Highlights
Photonic crystals (PCs) are one-dimensional (1D), two-dimensional (2D), or three-dimensional (3D)ordered structures with a periodicity comparable to an optical wavelength
We have studied a nematic liquid crystal (LC) (NLC) layer in a dielectric multilayer as a defect in a 1D PC [25,26,27,28], in which the wavelengths of defect modes were controlled upon applying an electric field based on a change in the optical length of the defect layer caused by field-induced molecular reorientation of the nematic liquid crystal (NLC)
Polarization microscope images of the NLC defect layer are shown in Figure 2a–c, where we used the circuits to apply a voltage to the six electrodes
Summary
Photonic crystals (PCs) are one-dimensional (1D), two-dimensional (2D), or three-dimensional (3D). Ordered structures with a periodicity comparable to an optical wavelength They are composed of two or more different dielectrics and their periodicity opens up a photonic band gap (PBG) in which the Crystals 2015, 5 existence of photons is forbidden [1,2]. 3D PBG materials with a defect allow us to achieve a 3D photon confinement Such an optical confinement is the most important feature of PCs because an electric field in a defect can be strongly enhanced at a defect mode resonance frequency. An appropriate line defect in a 2D or 3D PC serves as a waveguide that can guide light in a desired direction by PBG confinement [13,14] Such a defect acting as a microcavity or a waveguide is very important in certain applications, such as low-threshold lasers, micro-waveguides, and optical circuits [13,14,15,16,17,18,19]. The finite difference time domain (FDTD) simulation is performed to investigate the polarization of transmitted light from the 1D PC with the NLC defect
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
