Abstract
A highly efficient design of a two-channel wavelength demultiplexer in the visible region is presented with finite-difference time-domain simulations. The design process is described in detail with particular attention to the challenges inherent in fabrication of an actual device. A 2D triangular lattice photonic crystal with 75nm air pores in a silicon nitride planar waveguide provides the confinement for visible light. The device losses due to fabrication errors such as stitching misalignment of write fields during e-beam lithography and variation in air pore diameters from etching are modeled using realistic parameters from initial fabrication runs. These simulation results will be used to guide our next generation design of high efficiency photonic crystal based demultiplexing devices.
Highlights
A photonic crystal is an artificial material that gives us the ability to control the propagation of light by the addition of particular defects within the regular photonic lattice [1]
When the transmission of the a linear waveguide is modeled as the row of air pores along the edge of the waveguide is varied from 100 to 180 nm in diameter, we find that there is no effect on transmission for air pores that are smaller than the 150 nm range, but that when the air pores reach 160 nm and greater, the transmission drops significantly with a transmission of 50% at 160 nm and below 10% at 170 and above
By implementing a photonic band gap (PBG) semi reflector with a high Q factor-coupling cavity augmented by specific waveguide widths, we have determined
Summary
A photonic crystal is an artificial material that gives us the ability to control the propagation of light by the addition of particular defects within the regular photonic lattice [1]. A photonic crystal’s ability to guide light efficiently and to confine a single wavelength within the crystal makes them a promising addition to the currently available electron-based semiconductor devices. A number of different photonic band gap (PBG) optoelectronic devices have been implemented since 1987 including photonic crystal based fiber optics [2], frequency selective mirrors, filters [3], and efficient lasers [4]. In realizing the photonic crystal based WDDM, different wavelength selective filtering techniques have been used. Demultiplexing has been achieved by varying the PBG waveguide edge pore diameters [14, 15]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
