Journal ArticleDOI
Multilayer waveguide-grating filters.
S. S. Wang,Robert Magnusson +1 more
TLDR
The properties of guided-mode resonance reflection filters constructed with multiple thin- film layers are addressed and it is found that, for a given high modulation index, the double-layer antireflection thin-film approximation fails, whereas for the same modulation in a triple-layer system it holds firmly.Abstract:
The properties of guided-mode resonance reflection filters constructed with multiple thin-film layers are addressed. Greatly improved filter characteristics are shown to follow by the incorporation of multiple homogeneous layers with the spatially modulated layer. Calculated results for single-layer, double-layer, and triple-layer filter structures are presented. Whereas good filter characteristics are obtainable with single layers that are half-resonance-wavelength thick, there remains a residual reflection in the sidebands unless the cover and the substrate permittivities are equal. With double-layer and triple-layer designs, extensive wavelength ranges with low sideband-reflectance values are shown to be possible without requiring equal cover and substrate permittivities. The antireflection properties of the layer stack can be understood if the modulated layer is modeled as a homogeneous layer characterized by its average relative permittivity. However, as the grating-modulation index increases, this approximation deteriorates. In particular it is found that, for a given high modulation index, the double-layer antireflection thin-film approximation fails, whereas for the same modulation in a triple-layer system it holds firmly. Multilayer designs can thus have significantly large filter passbands, as they may contain heavily modulated resonant gratings without corruption of the ideal filter characteristics.read more
Citations
More filters
Journal ArticleDOI
High-efficiency guided-mode resonance filter
TL;DR: High-efficiency double-peak resonances occurred at nonnormal incidence, with the spectral locations of the maxima vayring with the incidence angle agreed well with the theoretically calculated reflectance curves.
Journal ArticleDOI
Reflection and transmission guided-mode resonance filters
Sorin Tibuleac,Robert Magnusson +1 more
Abstract: New reflection and transmission optical filters based on guided-mode resonances in multilayer waveguide gratings are characterized and compared with homogeneous thin-film filters. These guided-mode resonance filters are implemented by integration of diffraction gratings into classical thin-film multilayers to produce high-efficiency filter response and arbitrarily low sidebands extended over a large spectral range. Compared with homogeneous thin-film reflection filters, guided-mode resonance reflection filters require significantly fewer layers for a narrow linewidth and a high peak response to be obtained. The single-grating transmission filters presented have a narrower linewidth than Fabry–Perot filters with an equal number of layers and similar materials while maintaining high peak transmittance and low sidebands.
Journal ArticleDOI
Transmission bandpass guided-mode resonance filters.
Robert Magnusson,S. S. Wang +1 more
TL;DR: It is shown that the guided-mode resonance effects associated with waveguide gratings can be used to realize transmission bandpass filters with high efficiency, narrow linewidth, symmetrical response, and low sidebands.
Patent
Efficient bandpass reflection and transmission filters with low sidebands based on guided-mode resonance effects
Robert Magnusson,Shu-Shaw Wang +1 more
TL;DR: In this article, an ideal or near ideal filter for reflecting or transmitting electromagnetic waves having wavelength range of approximately 100 nm to 10 cm is disclosed, which combines a dielectric multilayer structure with a resonant waveguide grating and is valid for both TE and TM polarized waves.
Journal ArticleDOI
Adaptive finite-element method for diffraction gratings
Gang Bao,Zhiming Chen,Haijun Wu +2 more
TL;DR: A second-order finite-element adaptive strategy with error control for one-dimensional grating problems is developed and is expected to increase significantly the accuracy and efficiency of the discretization as well as reduce the computation cost.
References
More filters
Journal ArticleDOI
Theory and applications of guided-mode resonance filters
S. S. Wang,Robert Magnusson +1 more
TL;DR: The guided-mode resonance filter represents a basic new optical element with significant potential for practical applications and is presented and explained.
Journal ArticleDOI
A New Theory of Wood’s Anomalies on Optical Gratings
A. Hessel,A. A. Oliner +1 more
TL;DR: In this paper, a new theory of Wood's anomalies is presented which is based on a guided wave approach rather than the customary multiple scattering procedure, which provides both new insight and a method of calculation.
Journal ArticleDOI
Analysis and applications of optical diffraction by gratings
Thomas K. Gaylord,M. G. Moharam +1 more
TL;DR: In this article, an exact formulation of the grating diffraction problem without approximations is presented, using a series of fundamental assumptions, which reduces to the various existing approximate theories in the appropriate limits.
Journal ArticleDOI
Diffraction analysis of dielectric surface-relief gratings
M. G. Moharam,Thomas K. Gaylord +1 more
TL;DR: In this article, a dielectric surface-relief grating is analyzed using rigorous coupled-wave theory and the analysis applies to arbitrary grating profiles, groove depths, angles of incidence, and wavelengths.
Journal ArticleDOI
New principle for optical filters
Robert Magnusson,Shuling Wang +1 more
TL;DR: In this paper, a theoretical characterization of the guided-mode resonance properties of planar dielectric waveguide gratings is presented, and the linewidths of the resonances can be controlled by the grating modulation amplitude.