Browsing by Author "Dyankov, G"

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All-fiber optic parametric oscillator based on second order nonlinearity
(2005)
Dyankov, G
;
Chen, NK
;
Chi, S
;
光電工程學系
;
Department of Photonics
An all-fiber parametric oscillator based on (chi)(2) nonlinearity is presented. Nonlinear process takes place in a new type fiber coupler - (chi)(2) grating assisted coupler which consists a part of fiber ring resonator.
Left handed composite materials in the optical range
(2005-03-01)
Voskoboynikov, O
;
Dyankov, G
;
Wijers, CMJ
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
The purpose of this paper is to show that semiconductor nano-structures built from non-magnetic InAs/GaAs nano-rings can exhibit simultaneously negative effective permittivity and permeability over a certain optical frequency range. The structures are resonant and have this property near the edge of absorption of the nano-rings. This can be particularly interesting in the investigation of the challenging problem of development of left-handed composite materials in the optical range. (c) 2005 Elsevier Ltd. All rights reserved.
Optimization of second harmonic generation in non-linear film structure
(2004-06-01)
Dyankov, G
;
Chen, HY
;
Chao, S
;
Chi, S
;
光電工程學系
The problem about optimization of second harmonic generation (SHG) by a laser beam in a non-linear medium with dimensions less than the beam size has not been solved yet. We present a theoretical method providing an optimization of SHG in the case of non-linear film non-waveguide structure. We have found that even in the case of perfect phase matching there is an optimum length for maximum non-linear interaction. The dependence of generation efficiency on different type of non-linear profiles has been established and related with experimental results. (C) 2004 Elsevier B.V. All rights reserved.