OpenFilters: open-source software for the design, optimization, and synthesis of optical filters
TL;DR: The in-house software, called OpenFilters, is released under the GNU General Public License, an open-source license, and allows creation of multilayer and graded-index filters and calculation of reflection, transmission, absorption, phase, group delay, groupdelay dispersion, color, ellipsometric variables, admittance diagram, circle diagram, electric field distribution, and generation of reflection and transmission monitoring curves.
Abstract: The design of optical filters relies on powerful computer-assisted methods. Many of these methods are provided by commercial programs, but, in order to adapt and improve them, or to develop new methods, one needs to create his own software. To help people interested in such a process, we decided to release our in-house software, called OpenFilters, under the GNU General Public License, an open-source license. It is programmed in Python and C++, and the graphical user interface is implemented with wxPython. It allows creation of multilayer and graded-index filters and calculation of reflection, transmission, absorption, phase, group delay, group delay dispersion, color, ellipsometric variables, admittance diagram, circle diagram, electric field distribution, and generation of reflection, transmission, and ellipsometric monitoring curves. It also provides the refinement, needle, step, and Fourier transform methods.
Citations
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TL;DR: In this paper, a nanophotonic radiation interference system is used to transform a tungsten filament into a highly efficient thermal emitter for lighting applications, which can be used in both indoor and outdoor applications.
Abstract: A nanophotonic radiation interference system transforms a tungsten filament into a highly efficient thermal emitter for lighting applications.
166 citations
TL;DR: In this paper, a general methodology for the determination of the optimal spectral splitting parameters in hybrid photovoltaic/thermal (PV/T) collectors is presented, which is applied in the design of a novel PV/T collector which is also modeled in detail using the ray tracing software Zemax 12.
110 citations
TL;DR: In this article, the authors demonstrate enhanced photon recycling and open-circuit voltage enhancement using a narrow band dielectric multilayer angle restrictor on a high quality GaAs cell.
Abstract: For cells near the radiative limit, optically limiting the angles of emitted light causes emitted photons to be recycled back to the cell, leading to enhancement in voltage and efficiency. While this has been understood theoretically for some time, only recently have GaAs cells reached sufficient quality for the effect to be experimentally observed. Here, as proof of concept, we demonstrate enhanced photon recycling and open-circuit voltage (Voc) experimentally using a narrow band dielectric multilayer angle restrictor on a high quality GaAs cell. With angle restriction we observe a clear decrease in the radiative dark current, which is consistent with the observed Voc increase. Furthermore, we observe larger Voc enhancements for cells that are closer to the radiative limit, and that more closely coupling the angle restrictor to the cell leads to greater Voc gains, emphasizing the optical nature of the effect.
74 citations
Cites methods from "OpenFilters: open-source software f..."
...2 Optical Coupler Fabrication and Characterization The angle restricting dielectric multilayer was designed and modeled with a transfer matrix method approach using the OpenFilters program [19]....
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TL;DR: A subsequent investigation by Raman, X-ray photoelectron, and UV-vis reflection spectroscopy, as well as by electrical four-point probe measurements, demonstrates that the layered nanosheets transform into nanocrystalline graphene, opening up a new path for the fabrication of ultrathin functional conductive coatings.
Abstract: Carbon nanosheets are mechanically stable, free-standing two-dimensional materials with a thickness of ≈1 nm and well defined physical and chemical properties. They are made by radiation-induced cross-linking of aromatic self-assembled monolayers. Herein, a route is presented to the scalable fabrication of multilayer nanosheets with tunable electrical, optical, and chemical properties on insulating substrates. Stacks of up to five nanosheets with sizes of ≈1 cm(2) on oxidized silicon are studied. Their optical characteristics are investigated by visual inspection, optical microscopy, UV-vis reflection spectroscopy, and model calculations. Their chemical composition is studied by X-ray photoelectron spectroscopy. The multilayer samples are then annealed in an ultrahigh vacuum at various temperatures up to 1100 K. A subsequent investigation by Raman, X-ray photoelectron, and UV-vis reflection spectroscopy, as well as by electrical four-point probe measurements, demonstrates that the layered nanosheets transform into nanocrystalline graphene. This structural and chemical transformation is accompanied by changes in the optical properties and electrical conductivity and opens up a new path for the fabrication of ultrathin functional conductive coatings.
58 citations
TL;DR: In this article, the effect of porosity on the physical and electrochromic properties of WO3 was studied by radio frequency magnetron sputtering and the best performing films were combined into a 27 layer quarter-wave interference filter which is shown to cycle between bleached and colored states, while providing attractive transmission.
55 citations
References
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Book•
12 Jul 1985
TL;DR: In this paper, E.D. Palik and R.R. Potter, Basic Parameters for Measuring Optical Properties, and W.W.Hunter, Measurement of Optical Constants in the Vacuum Ultraviolet Spectral Region.
Abstract: VOLUME ONE: Determination of Optical Constants: E.D. Palik, Introductory Remarks. R.F. Potter, Basic Parameters for Measuring Optical Properties. D.Y. Smith, Dispersion Theory, Sum Rules, and Their Application to the Analysis of Optical Data. W.R. Hunter, Measurement of Optical Constants in the Vacuum Ultraviolet Spectral Region. D.E. Aspnes, The Accurate Determination of Optical Properties by Ellipsometry. J. Shamir, Interferometric Methods for the Determination of Thin-Film Parameters. P.A. Temple, Thin-Film Absorplance Measurements Using Laser Colorimetry. G.J. Simonis, Complex Index of Refraction Measurements of Near-Millimeter Wavelengths. B. Jensen, The Quantum Extension of the Drude--Zener Theory in Polar Semiconductors. D.W. Lynch, Interband Absorption--Mechanisms and Interpretation. S.S. Mitra, Optical Properties of Nonmetallic Solids for Photon Energies below the Fundamental Band Gap. Critiques--Metals: D.W. Lynch and W.R. Hunter, Comments of the Optical Constants of Metals and an Introduction to the Data for Several Metals. D.Y. Smith, E. Shiles, and M. Inokuti, The Optical Properties of Metallic Aluminum. Critiques--Semiconductors: E.D. Palik, Cadium Telluride (CdTe). E.D. Palik, Gallium Arsenide (GaAs). A. Borghesi and G. Guizzetti, Gallium Phosphide (GaP). R.F. Potter, Germanium (Ge). E.D. Palik and R.T. Holm, Indium Arsenide (InAs). R.T. Holm, Indium Antimonide (InSb). O.J. Glembocki and H. Piller, Indium Phosphide (InP). G. Bauer and H. Krenn, Lead Selenide (PbSe). G. Guizzetti and A. Borghesi, Lead Sulfide (PbS). G. Bauer and H. Krenn, Lead Telluride (PbTe). D.F. Edwards, Silicon (Si). H. Piller, Silicon (Amorphous) (-Si). W.J. Choyke and E.D. Palik, Silicon Carbide (SiC). E.D. Palik and A. Addamiano, Zinc Sulfide (ZnS). Critiques--Insulators: D.J. Treacy, Arsenic Selenide (As 2 gt Se 3 gt ). D.J. Treacy, Arsenic Sulfide (As 2 gt S 3 gt ). D.F. Edwards and H.R. Philipp, Cubic Carbon (Diamond). E.D. Palik and W.R. Hunter, Litium Fluoride (LiF). E.D. Palik, Lithium Niobote (LiNbO 3 gt ). E.D. Palik, Potassium Chloride (KCl). H.R. Philipp, Silicon Dioxide (SiO 2 gt ), Type ( (Crystalline). H.R. Philipp, Silicon Dioxide (SiO 2 gt ) (Glass). gt H.R. Philipp, Silicon Monoxide (SiO) (Noncrystalline). H.R. Philipp, Silicon Nitride (Si 3 gt N 4 gt ) (Noncrystalline). J.E. Eldridge and E.D. Palik, Sodium Chloride (NaCl). M.W. Ribarsky, Titanium Dioxide (TiO 2 gt ) (Rutile).
17,491 citations
01 Jan 1978
4,100 citations
492 citations
"OpenFilters: open-source software f..." refers background or methods in this paper
...OpenFilters calculates the filter properties using the characteristic matrix approach developed by Abelès [5] and presented in detail in most optical coating textbooks such as Macleod’s [6]....
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...The abeles module is named after Florin Abelès who first presented the characteristic matrix approach to calculate the optical properties of optical coatings [5]....
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TL;DR: It is shown that the control of the index gradient as a design parameter can significantly enhance the performance of interference coatings.
Abstract: Thin-film gradient-index profiles have been analyzed and new profiles have been synthesized for broadband antireflection coatings on dielectric surfaces. It is shown that the control of the index gradient as a design parameter can significantly enhance the performance of interference coatings.
403 citations
"OpenFilters: open-source software f..." refers background in this paper
...One particularly effective antireflective layer to avoid reflection between two materials of indices n1 and n2 is the quintic index profile [36]...
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TL;DR: The authors' experience with the application of the needle optimization technique to the design of optical coating is summarized and a physical interpretation of the technique is provided.
Abstract: The authors' experience with the application of the needle optimization technique to the design of optical coating is summarized. A physical interpretation of the technique is provided, and its main features are identified. Guidelines on the application of the needle optimization technique to various types of design problems are given.
309 citations