In this paper, we report the investigation of two-dimensional organic photonic crystal microcavity laser (2D OPCM). The
gain medium consists of an Alq3:DCJTB layer deposited on a planar Si3N4 photonic crystal microcavity. Both H2 and
L3 photonic crystal cavities are studied in terms of quality factor and the resonance wavelength by 3D FDTD
simulations. The structures are characterized under optical pumping by using a Nd:YAG frequency-tripled laser emitting
at 355 nm with a repetition frequency of 10 Hz and a pulse duration of 6 ns. A laser peak at 652 nm is observed for both
cavities with lasing thresholds of 0.014 nJ and 0.017 nJ for the H2 and the L3 cavities, respectively.
The optical properties of two-dimensional (2D) photonic crystal (PhC) slabs based on self-assembled monolayer of
dielectric microspheres are studied. The in-plane transmission spectra of 2D array of dielectric spheres with triangular
lattice are investigated using the finite-difference-time-domain (FDTD) method. The structures studied are monolayer of
dielectric spheres infiltrated with air ('opals') and air spheres infiltrated with dielectric material ('inverse opals'), with
glass substrate sustaining the monolayer of spheres. The transmission spectra are calculated for different values of
refractive index contrasts between the spheres and the infiltrated material and for different values of filling fractions
(compactness of the spheres). As the refractive index is varied, compact spheres are assumed; and as the filling fraction
is varied, the refractive index of the dielectric spheres or the dielectric matrix is fixed to be 2.5. For compact opal
structure on glass substrate, a narrow photonic band gap (PBG) is observed in the transmission spectra for dielectric
spheres with refractive index higher than around 1.9. When the refractive index is fixed at 2.5, the PBG is observed for
more compact spherical arrangement and disappears for more separated spheres. While for inverse opal structure on
glass substrate, using non-compact spheres enlarges the width of PBG which is not observed for compact spherical
arrangement. The application of the study is to realize organic PhC microcavity laser.
Impedance matching in negative index 2D air hole array was addressed by the retrieval of the effective parameters. By
solving the eigenvalues problem, we first stress the major difference between an electromagnetic confinement in air for
the ground right handed branch and in the host matrix for the left handed one. We then calculate the complex
transmission and reflection coefficients for a finite slab from which the effective refractive index and impedance are
deduced by using a Fresnel inversion technique. The criterion n = -1 was found incompatible with the impedance
matching condition z = 1. Also, the relevance of the dispersion characteristics was assessed by a technique based on
spatial Fourier transform.
There has been an increasing interest in using photonic crystals as negative refraction index slabs for integrated
nanophotonics. According to the superlensing criteria, a refractive index equal to -1 is needed to operate at an arbitrary
wavelength [1-2]. The field distribution is the result of multiple propagation phenomena such as reflection, diffraction,
self collimation and negative refraction. We report on the optimization of focusing properties of a triangular air hole
lattice etched in a III-V semiconductor matrix and present the demonstration of negative refraction by FDTD 3D
calculations. Under isotropy and finite length conditions, light transmission in the second band was investigated for an
incident wave tilted by 0°, 2°, 7° and 15° (E Field parallel to the air holes). The advantage of our method lies in the
existence of Fabry-Pérot effect resulting of interferences between the front and the rear interface of the slab. From the
comparison of each transmission spectrum, the filling factor was adjusted to obtain simultaneously n = -1 and a
maximum of signal to operate at a wavelength of 1.55 micrometers. At least, the validity of this method to produce an
intensity maximum behind the slab was checked by mapping the field with FDTD 3D simulations.
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