Conference article, meeting abstract
Photon control by multi-periodic binary grating waveguides: A coupled-mode theory approach
Publication Details
Authors: | Adam, J.; Lüder, H.; Gerken, M. |
Publication year: | 2015 |
Pages range : | TBD |
Book title: | Optical wave and waveguide theory and numerical modelling workshop - City University, London, London, United Kingdom : Duration: 17. Apr 2015 - 18. Apr 2015 |
URN / URL: |
Abstract
In order to control the photon emission from thin-film devices, high-index layer structuring is frequently used to increase guided light outcoupling efficiency. Multi-periodic nanostructures, yielded by a logical disjunction of multiple binary gratings, have recently been proposed to achieve simul- taneous control over multiple spectral resonance positions and relative intensities. The experimental findings were theoretically backed up by a rigorous coupled-wave analysis (RCWA) approach, yielding the leaky modes{\textquoteright} complex propagation constants and diffraction efficiencies. This approach, however, can only lead to quantitative results outside the device{\textquoteright}s band gaps, since only radiative propagation loss is calculated.n order to provide more physical and quantitative insight to grating-induced waveguide losses, we implemented a coupled-mode theory (CMT) approach for the semi-analytical treatment of the corrugated waveguides modal behavior. In this contribution, we present guided-to-guided as well as guided-to-radiation mode coupling in multi-periodic binary grating waveguides.
In order to control the photon emission from thin-film devices, high-index layer structuring is frequently used to increase guided light outcoupling efficiency. Multi-periodic nanostructures, yielded by a logical disjunction of multiple binary gratings, have recently been proposed to achieve simul- taneous control over multiple spectral resonance positions and relative intensities. The experimental findings were theoretically backed up by a rigorous coupled-wave analysis (RCWA) approach, yielding the leaky modes{\textquoteright} complex propagation constants and diffraction efficiencies. This approach, however, can only lead to quantitative results outside the device{\textquoteright}s band gaps, since only radiative propagation loss is calculated.n order to provide more physical and quantitative insight to grating-induced waveguide losses, we implemented a coupled-mode theory (CMT) approach for the semi-analytical treatment of the corrugated waveguides modal behavior. In this contribution, we present guided-to-guided as well as guided-to-radiation mode coupling in multi-periodic binary grating waveguides.
