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Journal of Nanophotonics • new

Induced high-order resonance linewidth shrinking with multiple coupled resonators in silicon-organic hybrid slotted two-dimensional photonic crystals for reduced optical switching power in bistable devices
Author(s): Thu Trang Hoang; Quang Minh Ngo; Dinh Lam Vu; Khai Quang Le; Truong Khang Nguyen; Hieu Pham Trung Nguyen
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Paper Abstract

Shrinking the linewidth of resonances induced by multiple coupled resonators is comprehensively analyzed using the coupled-mode theory (CMT) in time. Two types of coupled resonators under investigation are coupled resonator optical waveguides (CROWs) and side-coupled resonators with waveguide (SCREW). We examine the main parameters influencing on the spectral response such as the number of resonators (n) and the phase shift (φ) between two adjacent resonators. For the CROWs geometry consisting of n coupled resonators, we observe the quality (Q) factor of the right- and left-most resonant lineshapes increases n times larger than that of a single resonator. For the SCREW geometry, relying on the phase shift, sharp, and asymmetric resonant lineshape of the high Q factor a narrow linewidth of the spectral response could be achieved. We employ the finite-difference time-domain (FDTD) method to design and simulate two proposed resonators for practical applications. The proposed coupled resonators in silicon-on-insulator (SOI) slotted two-dimensional (2-D) photonic crystals (PhCs) filled and covered with a low refractive index organic material. Slotted PhC waveguides and cavities are designed to enhance the electromagnetic intensity and to confine the light into small cross-sectional area with low refractive index so that efficient optical devices could be achieved. A good agreement between the theoretical CMT analysis and the FDTD simulation is shown as an evidence for our accurate investigation. All-optical switches based on the CROWs in the SOI slotted 2-D PhC waveguide that are filled and covered by a nonlinear organic cladding to overcome the limitations of its well-known intrinsic properties are also presented. From the calculations, we introduce a dependency of the normalized linewidth of the right-most resonance and its switching power of the all-optical switches on number of resonator, n. This result might provide a guideline for all-optical signal processing on a silicon PhC chip design.

Paper Details

Date Published: 13 February 2018
PDF: 13 pages
J. Nanophoton. 12(1) 016014 doi: 10.1117/1.JNP.12.016014
Published in: Journal of Nanophotonics Volume 12, Issue 1
Show Author Affiliations
Thu Trang Hoang, Vietnam Academy of Science and Technology (Viet Nam)
Quang Minh Ngo, Vietnam Academy of Science and Technology (Viet Nam)
Dinh Lam Vu, Vietnam Academy of Science and Technology (Viet Nam)
Khai Quang Le, Ton Duc Thang Univ. (Viet Nam)
Truong Khang Nguyen, Ton Duc Thang Univ. (Viet Nam)
Hieu Pham Trung Nguyen, New Jersey Institute of Technology (United States)

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