Improved photonic crystal directional coupler with short length
Source abstract
Abstract
We investigate a photonic crystal (PC) waveguide coupler which is formed by two closely spaced linear waveguides in a two-dimensional triangular lattice of air holes. Our study shows that shifting one row of the air holes between the waveguides affects the dispersion curves of the guided modes and if the triangular lattice of air holes between the waveguides is replaced by a rectangular lattice, this modification results in an ultra-short coupling structure with coupling length less than 3a, where a is the lattice constant. Also, we investigate the effect of changing the radii of air holes that are adjacent to or between the waveguides on the coupling length and show that increasing the radius of air holes between the waveguides decreases the coupling length. We analyze the output spectrum of an ultra-short channel drop filter designed based on this structure.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Photonic Crystals and Applications · Photonic and Optical Devices · Fern and Epiphyte Biology
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References (22)
Show source-provided references
1. Joannopoulos · 2002
2. Design of a novel wideband single-mode waveguide in a photonic crystal slab structure10.1016/j.photonics.2008.05.001 ↗
3. Intermediate-mode-assisted optical directional couplers via embedded periodic structure10.1109/3.709596 ↗
4. Coupling and decoupling of electromagnetic waves in parallel 2-D photonic crystal waveguides10.1109/3.973318 ↗
5. Photonic crystal-based dual-band demultiplexer on silican materials10.1007/s11082-007-9118-0 ↗
6. Dual-band multiplexer/demultiplexer with photonic-crystal-waveguide couplers for bidirectional communications10.1016/j.optcom.2006.05.055 ↗
7. Photonic crystal waveguide directional couplers as wavelength selective optical filters10.1016/j.optcom.2003.11.026 ↗
8. Highly efficient multi channel drop filter in a two dimensional hetro photonic crystal10.1364/OE.14.003491 ↗
9. Photonic crystal directional coupler switch with small switching length and wide bandwidth10.1364/OE.14.001223 ↗
10. Electro-optical switching using coupled photonic crystal waveguides10.1364/OE.10.001048 ↗
11. Photonic crystal power-splitter based on mode splitting of directional coupling waveguides10.1007/s11082-006-9001-4 ↗
12. Fabrication and characterization of photonic crystal-based symmetric Mach-Zender structure based on GaAs membrance slab waveguides10.1109/JSAC.2005.851219 ↗
13. Bi-periodic photonic crystal Y-splitter10.1016/j.physe.2009.04.025 ↗
14. Compact wavelength demultiplexing using focusing negative index photonic crystal superprisms10.1364/OE.14.002413 ↗
15. Photonic crystal directional couplers formed by InAlGaAs nano-rods10.1364/OPEX.13.000038 ↗
16. Integration of grating couplers with a compact photonic crystal demultiplexer on an InP membrane10.1364/OL.33.000884 ↗
17. Ultracompact and low-power optical switch based on silicon photonic crystals10.1364/OL.33.000147 ↗
18. Ultra-fast photonic crystal/quantum dot all optical switch for future photonic networks10.1364/OPEX.12.006606 ↗
19. InP-based compact photonic crystal directional coupler with large operation range10.1364/OE.15.008472 ↗
20. Ultrashort 2-D photonic crystal directional couplers10.1109/LPT.2003.810258 ↗
21. Linearization of the coupling coefficient curve of a photonic crystal waveguide coupler
22. A 60° photonic crystal waveguide bend with improved transmission characteristics