Thin-film optical filters with diffractive elements and waveguides

Shin, Dong-Ho; Tibuleac, Sorin; Maldonado, Theresa A.; Magnusson, Robert

doi:10.1117/1.601764

Cited by 89 publications

(32 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First, we recognize that spectral reflectance of filters can be significantly altered by differences in the values of refractive indices used in simulation and those that are realized during fabrication 30. Such differences may arise from spectral dispersion, from film structure at the nano-microscale as well as due to confinement effects 33.…”

Section: Resultsmentioning

confidence: 99%

“…For the same structure, the reflection resonances are dependent on the polarization state of the incident wave and the angle at which it is incident. With a TE polarized incident wave at angle θ, for a particular order diffracted wave to be a leaky Eigen mode, the introduced modulation parameter should satisfy the inequality30:

Max {n^{c}, n^{s}} \leq | n^{c} sin θ - \frac{p}{ν Λ} | < Max {n^{g r}, n^{w g}}

…”

Section: Theory and Modelingmentioning

confidence: 99%

See 1 more Smart Citation

Narrowband Midinfrared Reflectance Filters Using Guided Mode Resonance

Kodali

Schulmerich

et al. 2010

Anal. Chem.

View full text Add to dashboard Cite

There is a need to develop mid-infrared (IR) spectrometers for applications in which the absorbance of only a few vibrational mode (optical) frequencies needs to be recorded; unfortunately, there are limited alternatives for the same. The key requirement is the development of a means to access discretely a small set of spectral positions from the wideband thermal sources commonly used for spectroscopy. We present here the theory, design and practical realization of a new class of filters in the mid-infrared (IR) spectral regions based on using guided mode resonances (GMR) for narrowband optical reflection. A simple, periodic surface-relief configuration is chosen to enable both a spectral response and facile fabrication. A theoretical model based on rigorous coupled wave analysis is developed, incorporating anomalous dispersion of filter materials in the mid-IR spectral region. As a proof-of-principle demonstration, a set of four filters for a spectral region around the C-H stretching mode (2600–3000 cm−1) are fabricated and responses compared to theory. The reflectance spectra were well-predicted by the developed theory and results were found to be sensitive to the angle of incidence and dispersion characteristics of the material. In summary, the work reported here forms the basis for a rational design of filters that can prove useful for IR absorption spectroscopy.

show abstract

Section: Resultsmentioning

confidence: 99%

Max {n^{c}, n^{s}} \leq | n^{c} sin θ - \frac{p}{ν Λ} | < Max {n^{g r}, n^{w g}}

…”

Section: Theory and Modelingmentioning

confidence: 99%

Narrowband Midinfrared Reflectance Filters Using Guided Mode Resonance

Kodali

Schulmerich

et al. 2010

Anal. Chem.

View full text Add to dashboard Cite

show abstract

“…An efficient energy exchange occurs between the reflected and transmitted waves, resulting in sharp peaks in the diffraction efficiency spectrum of the resonant waveguide grating. [22][23][24] The grating couples the incident wave into the resonant waveguide-grating structure. A resonance occurs when one of the diffracted waves generated by the grating element phase matches to a leaky waveguide mode admitted by the waveguide structure, as schematically depicted in Fig.…”

Section: Gmr Effect In Lossy Layersmentioning

confidence: 99%

Light management through guided-mode resonances in thin-film silicon solar cells

Khaleque

Magnusson

2014

J. Nanophoton

View full text Add to dashboard Cite

Abstract. We theoretically explain and experimentally demonstrate light trapping in thin-film solar cells through guided-mode resonance (GMR) effects. Resonant field enhancement and propagation path elongation lead to enhanced solar absorption. We fabricate nanopatterned solar cells containing embedded 300-nm period, one-dimensional gratings. The grating pattern is fabricated on a glass substrate using laser interference lithography followed by a transparent conducting oxide coating as a top contact. A ∼320-nm thick p-i-n hydrogenated amorphous silicon solar cell is deposited over the patterned substrate followed by bottom contact deposition. We measure optical and electrical properties of the resonant solar cells. Compared to a planar reference solar cell, around 35% integrated absorption enhancement is observed over the 450 to 750-nm wavelength range. This light-management method results in enhanced short-circuit current density of 14.8 mA∕cm 2 , which is a ∼40% improvement over planar solar cells. Our experimental demonstration proves the potential of simple and well-designed GMR features in thinfilm solar cells. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

show abstract

“…Guided Mode Resonant Grating (GMRG) filter [1][2][3][4][5][6][7][8][9][10][11][12][13][14] have attract more and more attention by many research groups due to its excellent filtering properties such as high peak diffraction, low sideband reflection and narrow resonant filter width. These characteristics have made GMRG filter can be applied in the many fields including laser devices, biotechnology and optical communications [1,2,[15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Application to the design of guide-mode resonance grating filter with using simulated annealing method

Fan

Zhou

et al. 2010

SPIE Proceedings

View full text Add to dashboard Cite

Although there are several well -known methods such as RCWA, FMM, for analyzing the diffraction properties of gratings, design of these optical elements with specified spectral properties is commonly a challenging problem. It is relatively not easy for the researchers to design narrow line-with diffraction filters based on guided mode resonance phenomenon with common diffraction algorithm. Simulated Annealing (SA) method is evolutionary, robust technique that has been widely utilized to design optical diffraction components. This method is inspired by the physical process of heating and controlled cooling of metal material to increase the size of its crystals and reduce their defects. The most distinctive features of this method lie in its powerful ability of convergence towards the global minimum in a reasonable computation time and the independence of the initial parameter values. In this paper, first, the physical basis of SA and its mathematical realization are introduced. Then, a Guided-Mode Resonant Grating (GMRG) filters with single layer is designed by using SA algorithm. The central wavelength of GMRG filter is locked at 532nm and its line-width is fixed at 1nm. The plane wave light radiates the grating from air cover with normal incidence. The optimized parameters are refractive indices and thicknesses of high and low material of grating, other parameters are grating period and fill factor of the grating. It is shown from our calculation that an excellent reflection spectrum with narrow line-width, high peak and low sideband can be obtained after optimizing the grating parameters. Next, a double layered GMRG filter with line-width of 4nm, which is relatively easy fabrication in experiment, is designed at central wavelength of 1064nm. The optimized parameters are grating period, groove depth, refractive index of waveguide layer and fill factor respectively. The grating substrate and waveguide layer are Sio2 and Hfo2 respectively, the grating structure is directly etched on the waveguide layer. The above grating values should be included in reasonable ranges in consideration of grating fabrication in our experiment condition. It is demonstrated from the calculations with the parameters obtained from SA optimization algorithm that the peak diffraction efficiency is more than 99% at central wavelength 1064nm and the sideband reflection is depressed at the level bellow 5% in a large wavelength range. Moreover, the parameters of a triple layer GMRG filter structure are also provided with this powerful method. Meanwhile, the results found by SA method are compared with RCWA theory.

show abstract

Thin-film optical filters with diffractive elements and waveguides

Cited by 89 publications

References 0 publications

Narrowband Midinfrared Reflectance Filters Using Guided Mode Resonance

Narrowband Midinfrared Reflectance Filters Using Guided Mode Resonance

Light management through guided-mode resonances in thin-film silicon solar cells

Application to the design of guide-mode resonance grating filter with using simulated annealing method

Contact Info

Product

Resources

About