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Abstract

Design optimizations of asymmetric directional couplers for the fundamental quasi-TE (TM) mode with the higher order quasi-TE (TM) modes (de)multiplexer including the H21 y (H21 x), H31 y(H31 x), H41 y(H41 x), and H51 y(H51 x) modes are studied by a full-vectorial H-field finite-element method. Phase matching of nonidentical nanowires (NWs) are more critical and accuracy of the numerical method for the design is tested here. The effect of possible fabrication tolerance is also discussed thoroughly. These results show that a narrow separation of 100 nm or similar value can be employed for the quasi-TE mode splitters, but for the quasi-TM modes, a relatively wider separation of ~500 nm may be used. The fabrication of the single mode NW should be strictly accurate within ±5 nm of the design values.

Publication Type:	Article
Additional Information:	© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments:	School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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