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- 저자 : Khai Q. Le (검색결과 2 건)
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Le, Khai Q.,Kim, Sangin WILEY-VCH Verlag 2008 Physica status solidi. PSS. A, Applications and ma Vol.205 No.2
<P>In this paper, a theoretical model for the cross-plane thermal conductivity of layered quantum semiconductor structures is presented. This model is used to evaluate the cross-plane thermal conductivity of the active region in GaInAs/AlInAs-based quantum cascade (QC) lasers. We take into account the temperature dependent thermal conductivity of the layers. By including their interface thermal resistance and scattering processes via the multilayer quantum structure, we predict a decrease by an order of magnitude of the lattice thermal conductivity of the active region in GaInAs/AlInAs-based QC lasers. We computed that the cross-plane thermal conductivity of a InGaAs/AlInAs-based QC laser active region at low temperature from 80 K to 130 K is in the range of 0.5–0.7 W/(m K), whilst the average experimental value obtained by Lops et al. [13] is 0.6 W/(m K). In addition, using the result as input, we present a numerical investigation into the facet temperature profile in this laser during continuous-wave operation using a finite-element method. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
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Thu Trang Hoang,Khai Q. Le,Quang Minh Ngo 한국물리학회 2015 Current Applied Physics Vol.15 No.9
In this paper, we numerically investigate nonlinear optical responses in dielectric gratings coated by flat metallic surface, where the structural parameters are chosen for wavelengths of operation at the telecom regime. The presented designs show the output light reflection with respect to the incident intensity of increasing, decreasing, and non-monotonic belt-shape functions. Nonlinear optical responses including switching and bistability appeared in the telecom region owing to assistance of surface plasmon resonance excited at the metal/dielectric interface, which enhances the diffraction efficiency and induces the momentum matching for the leaky modes of the dielectric grating. This results in electric intensityeffective refractive index dependence enhancement in the Kerr nonlinear media. Our design and investigation of the linear and nonlinear optical responses will provide a general guideline for a hybrid metallic-dielectric structure-based optical switching/bistability device design.
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