One-dimensional anisotropic photonic crystal with a tunable bandgap

Polarized Light-Emission from Photonic Organic Light-Emitting Devices

“…5,000 cd/m 2 at 14.5 V. In contrast, as shown in Figure 3(b), the peak efficiencies (6.1 cd/A and 2.0 lm/W) of the sample OLED are much higher than those of the reference device (2.3 cd/A and 0.6 lm/W). The relatively high efficiencies of the sample device may be caused by the improved transition probability of exciton (singlet and triplet) relaxation with respect to the polarization along the transmission axis due to the reduced transition probability of exciton relaxation with respect to the polarization perpendicular to the transmission axis [20,33]. In order to interpret the observed EL characteristics of our sample device, we have also measured its polarization characteristics, as shown in Figure 4.…”

“…As an alternative, for the purpose of improving device performance, we suggest a technique to control the polarization of light emitted from OLEDs that are achieved using an anisotropic photonic crystal (PC) film. It has been predicted that in anisotropic PCs, the photonic band structure splits with respect to the state of polarization of the interacting light, in contrast to the degenerated band structure of conventional isotropic PCs, in which a certain energy range of photons is forbidden, giving rise to a photonic band gap (PBG) [18][19][20]. Of these applications, the study of light emission at the PBG edge is particularly attractive, as a result of the fact that the group velocity of photons approaches zero and the density of mode changes dramatically at the PBG edge [21][22][23][24].…”

Elliptical normal modes and stop band reconfiguration in multimode birefringent one-dimensional magnetophotonic crystals

“…Tunability has been explored through electrical [24][25][26][27][28][29], magnetic [8,29,[30][31][32], thermal [30,33], and mechanical control [34]; through immersion in coherent atomic gases [35], and through variations in the angle of incidence of the optical beam [36]. Magnetic tunability studies have consisted of theoretical band gap analysis focusing on dielectric permittivity or magnetic permeability control and their effect on gap width, band gap center wavelength [8,29,31,32], and the effect of magnetic fields on the superconducting state in photonic crystals composed of copper oxide high-temperature superconductors [30].…”

Double‐cavity Fabry–Pérot tunable equalizer based on 1D photonic crystals

“…Particularly, one-dimensional PCs have been known for several decades in the form of periodic multilayer coatings, consisting of stacked pairs of alternate dielectric or metal-dielectric layers with a large contrast of the dielectric constant along the propagation direction. The infiltration of several layers with liquid crystal (LC) allows tuning the optical properties of such structures, as has been proposed by several authors [1][2][3]. A particular case of one-dimensional multilayer structures are the Fabry-Pe´rot (FP) interferometers that can be seen as a one-dimensional PC with a defect that acts as a resonant cavity.…”