Design of Silicon-based Leaky-mode Resonant Nanopatterned Devices Using Inverse Numerical Methods
M. Shokooh-Saremi, R. Magnusson, T.J. Suleski, E.G. Johnson
University of Texas at Arlington, US
Keywords: particle swarm optimization, leaky-mode resonance, nanopatterning
Abstract:We present single-layer, silicon-based resonant leaky-mode elements implemented with periodic waveguide layers. This new device class has wide applicability in photonic devices and systems. Leaky waveguide modes can be exited when an incident light beam is coupled into the waveguide structure through an inscribed periodicity under phase-matching conditions. This results in generation of a guided-mode resonance field response in the spectrum. As the electromagnetic resonance response and associated leaky-mode field interactions are very complex in this class of devices, it is essential to apply efficient inverse numerical methods that find the device parameters yielding the desired spectra. Therefore, we apply particle swarm optimization (PSO) to design a variety of new 2D-nanopatterned resonance devices. For example, a broadband reflector with center wavelength of 1700 nm and bandwidth of ~161 nm across which the zero-order reflectance exceeds 99% is shown. Additionally, an efficient bandpass filter with spectral width of 2.0 nm at 1550 nm central wavelength is realized.