Browsing by Author "Sun, Yuh-Sien"

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High birefringence photonic crystal fiber with a complex unit cell of asymmetric elliptical air hole cladding
(2007-08-01)
Sun, Yuh-Sien
;
Chau, Yuan-Fong
;
Yeh, Han-Hsuan
;
Shen, Lin-Fang
;
Yang, Tzong-Jer
High birefringence induced by elliptical air hole photonic crystal fibers (EHPCFs) is analyzed numerically using the finite-element method. Statistical correlations between the birefringence and the various parameters are obtained. We found that the complex elliptical air hole is better than that of a circular one to obtain high birefringence in photonic crystal fibers. Our suggested structures can considerably enhance the birefringence in EHPCFs and show that the birefringence can be as high as 1.1294 x 10(-2), which is higher than the birefringence obtained from conventional step-index fiber (5 X 10(-4)), circular air holes PCF (3.7 X 10(-3)), and elliptical hollow PCF (2.35 x 10(-3)). (C) 2007 Optical Society of America.
The plasmon and distribution effects between incident light and active layer in PtOx-type super-resolution near-field structure
(2008-03-01)
Chau, Yuan-Fong
;
Tsai, Din Ping
;
Shen, Lin-Fang
;
Yang, Tzong-Jer
;
Sun, Yuh-Sien
The plasmon and distribution effects of collective localized surface plasmons between incident light and active layer of PtOx-type super resolution near-field structure (super-RENS) have been studied using finite-difference time-domain method. Four types of distribution of Pt nanoparticles, i.e., type A, B, C, and D in active layer are investigated. We find that type C and D in active layer can provide higher field intensity in a wider range of particle size when the particle sizes are varied, and the out-going filed emerging from the active layer exhibit smaller spot size than those of type A and B. Type B, C and D also provide the additional path longer than that of type A, and excite more evanescent field which located in the far edge of the bubble from the optical axis of the incident beam. Results show that the type C structure is the best choice in the view point of designing the PtOx-type super-RENS. This study provides new information to design a super-RENS with superior resolution as well as other applications in nano photonic devices. (C) 2007 Elsevier B.V. All rights reserved.