Inhibited Spontaneous Emission in Solid-State Physics and Electronics
ABSTRACT It has been recognized for some time that the spontaneous emission by atoms is not necessarily a fixed and immutable property of the coupling between matter and space, but that it can be controlled by modification of the properties of the radiation field. This is equally true in the solid state, where spontaneous emission plays a fundamental role in limiting the performance of semiconductor lasers, heterojunction bipolar transistors, and solar cells. If a three-dimensionally periodic dielectric structure has an electromagnetic band gap which overlaps the electronic band edge, then spontaneous emission can be rigorously forbidden.
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ABSTRACT: Third harmonic generation enhancement in periodic photonic structures was experimentally observed and theoretically interpreted. Nonlinear optical effects in opal globular photonic crystals (PC) have been studied under the femtosecond laser pumping. Strong dependence of the third harmonic generation efficiency on the ratio between the central pumping wavelength and the spectral location of the PC band gaps was found. Numerical simulations based on the finite difference time-domain technique for the solution of the Maxwell's equations were applied for investigations of the observed phenomenon origin. The simulation results have shown that the origin of the efficient nonlinear conversion is related with the surface state of electromagnetic field in PC. Interacting with the PC surface the light wavefront distorts coherently, and the effect of structure light focusing appears. Coherent wavefront distortion leads to the strong optical field localization, hence the light intensity within the certain PC regions increases. In case of the band gap pumping dramatic light redistribution appears; very sharp peaks of light intensity emerge in the region of the quartz globules, which leads to the high-efficient PC pumping. 1. Introduction and Background An appearance of novel materials, in particular, strongly correlated optical media: periodic photonic structures, photonic crystals (PC) [1-5] and quasi-crystals  has attracted considerable interest in the relevant branch of optics in the recent time. The PC is a structure characterized by a spatially periodic distribution of the medium optical characteristics. The period of oscillations is comparable to the wavelength of light [7,8]. Periodicity of the structure leads to the dramatic changes of the photon behavior in a PC in comparison to the homogeneous medium: the spatial periodicity produces the zone structure of the dispersion relation, described within the Bloch's effective field theory [9-10]. PCs could be used in waveguide applications , including PC fibers , for supercontinuum generation , for highly efficient nonlinear light conversion, high-harmonic generation and active media pumping [14-17], and for increased Raman scattering by particles injected into the PCs [18,19]. Surface states of light in PCs are an interesting phenomenon [20-27], and it could be utilized in wide range of applications, in particular, in nonlinear optics . PCs are the potential basis for the creation of new optical media and devices. The present paper is dedicated to the investigations of the third harmonic generation efficiency in opal PC, and to the research of the origin of this phenomenon by means of the numerical simulations of light interaction with the 2D PC structure.Journal of Physics Conference Series 01/2014; 541(1):051902.
- Physics of Plasmas 09/2014; 21(9):092104. · 2.25 Impact Factor
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ABSTRACT: Tunable superlattice plasma photonic crystals are obtained in a meshed dielectric barrier discharge. These plasma photonic crystals are composed of thin artificial lattices and thick self-organized lattices, and can be tuned easily by adjusting the applied voltage. A plasma photonic crystal with self-organized hexagonal lattice coupled to artificial square lattice is first realized. The dispersion relations of the square sublattices with different radii, which are recorded by an intensified charge-coupled device camera, are calculated. The results show that the thick square sublattice has the higher band edge frequencies and wider band widths. Band gaps of superlattice plasma photonic crystals are actually temporal integrations of those of transient sublattices.Physics of Plasmas 07/2014; 21(7):073505. · 2.25 Impact Factor