Ivan Čelanović
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View article: Nanophotonic thermal management in X-ray tubes
Nanophotonic thermal management in X-ray tubes Open
In X-ray tubes, more than 99% of the kilowatts of power supplied to generate X-rays via bremsstrahlung are lost in the form of heat generation in the anode. Therefore, thermal management is a critical barrier to the development of more pow…
View article: Discriminating electromagnetic radiation based on angle of incidence
Discriminating electromagnetic radiation based on angle of incidence Open
The present invention provides systems, articles, and methods for discriminating electromagnetic radiation based upon the angle of incidence of the electromagnetic radiation. In some cases, the materials and systems described herein can be…
View article: High efficiency incandescent lighting
High efficiency incandescent lighting Open
Incandescent lighting structure. The structure includes a thermal emitter that can, but does not have to, include a first photonic crystal on its surface to tailor thermal emission coupled to, in a high-view-factor geometry, a second photo…
View article: Methods and apparatus for broadband angular selectivity of electromagnetic waves
Methods and apparatus for broadband angular selectivity of electromagnetic waves Open
A filter to transmit incident radiation at a predetermined incidence angle includes a plurality of photonic crystal structures disposed substantially along a surface normal direction of the filter. The photonic crystal structure includes a…
View article: Thermophotovoltaic energy generation
Thermophotovoltaic energy generation Open
Inventive systems and methods for the generation of energy using thermophotovoltaic cells are described. Also described are systems and methods for selectively emitting electromagnetic radiation from an emitter for use in thermophotovoltai…
View article: Spectrally-engineered solar thermal photovoltaic devices
Spectrally-engineered solar thermal photovoltaic devices Open
A solar thermal photovoltaic device, and method of forming same, includes a solar absorber and a spectrally selective emitter formed on either side of a thermally conductive substrate. The solar absorber is configured to absorb incident so…
View article: Distributed Grid Control of Flexible Loads and DERs for Optimized Provision of Synthetic Regulating Reserves
Distributed Grid Control of Flexible Loads and DERs for Optimized Provision of Synthetic Regulating Reserves Open
Over the course of this project, we have successfully de-risked our distributed microgrid control architecture by tightly integrating its associated control algorithms into a unified software library, installing the software library on sev…
View article: Banshee distribution network benchmark and prototyping platform for hardware‐in‐the‐loop integration of microgrid and device controllers
Banshee distribution network benchmark and prototyping platform for hardware‐in‐the‐loop integration of microgrid and device controllers Open
This article provides a unique benchmark to integrate and systematically evaluate advanced functionalities of microgrid and downstream device controllers. The article describes Banshee, a real‐life power distribution network. It also detai…
View article: Practical emitters for thermophotovoltaics: a review
Practical emitters for thermophotovoltaics: a review Open
© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) Thermophotovoltaic (TPV) systems are promising for harnessing solar energy, waste heat, and heat from radioisotope decay or fuel combustion. TPV systems work by heating an em…
View article: Towards a portable mesoscale thermophotovoltaic generator
Towards a portable mesoscale thermophotovoltaic generator Open
Thermophotovoltaics (TPV) is the conversion of fuel to electricity with heat and light as intermediaries, and is a promising source of high energy density power at the mesoscale. This work describes our transition from our bench-top experi…
View article: Improved Omnidirectional 2D Photonic Crystal Selective Emitter for Thermophotovoltaics
Improved Omnidirectional 2D Photonic Crystal Selective Emitter for Thermophotovoltaics Open
Hafnia-filled, two dimensional (2D) tantalum (Ta) photonic crystals (PhCs) are promising emitters for high performance thermophotovoltaic (TPV) systems because they enable, for a wide range of incidence angles, efficient spectral tailoring…
View article: Towards a portable mesoscale thermophotovoltaic generator
Towards a portable mesoscale thermophotovoltaic generator Open
Thermophotovoltaics (TPV) is the conversion of fuel to electricity with heat and light as intermediaries, and is a promising source of high energy density power at the mesoscale. This work describes our transition from our bench-top experi…
View article: An integrated microcombustor and photonic crystal emitter for thermophotovoltaics
An integrated microcombustor and photonic crystal emitter for thermophotovoltaics Open
Thermophotovoltaic (TPV) energy conversion is appealing for portable millimeter- scale generators because of its simplicity, but it relies on a high temperatures. The performance and reliability of the high-temperature components, a microc…
View article: Fabrication of an Omnidirectional 2D Photonic Crystal Emitter for Thermophotovoltaics
Fabrication of an Omnidirectional 2D Photonic Crystal Emitter for Thermophotovoltaics Open
In a thermophotovoltaic (TPV) system, a heat source brings an emitter to incandescence and the spectrally confined thermal radiation is converted to electricity by a low-bandgap photovoltaic (PV) cell. Efficiency is dominated by the emitte…
View article: Fabrication of an Omnidirectional 2D Photonic Crystal Emitter for Thermophotovoltaics
Fabrication of an Omnidirectional 2D Photonic Crystal Emitter for Thermophotovoltaics Open
In a thermophotovoltaic (TPV) system, a heat source brings an emitter to incandescence and the spectrally confined thermal radiation is converted to electricity by a low-bandgap photovoltaic (PV) cell. Efficiency is dominated by the emitte…
View article: Roadmap on optical energy conversion
Roadmap on optical energy conversion Open
For decades, progress in the field of optical (including solar) energy conversion was dominated by advances in the conventional concentrating optics and materials design. In recent years, however, conceptual and technological breakthroughs…
View article: Improved Thermal Emitters for Thermophotovoltaic Energy Conversion
Improved Thermal Emitters for Thermophotovoltaic Energy Conversion Open
Thermophotovoltaic (TPV) energy conversion enables millimeter scale power generation required for portable microelectronics, robotics, etc. In a TPV system, a heat source heats a selective emitter to incandescence, the radiation from which…
View article: A Thermophotovoltaic System Using a Photonic Crystal Emitter
A Thermophotovoltaic System Using a Photonic Crystal Emitter Open
The increasing power demands of portable electronics and micro robotics has driven recent interest in millimeter-scale microgenerators. Many technologies (fuel cells, Stirling, thermoelectric, etc.) that potentially enable a portable hydro…
View article: Tailoring high-temperature radiation and the resurrection of the incandescent source
Tailoring high-temperature radiation and the resurrection of the incandescent source Open
In solar cells, the mismatch between the Sun's emission spectrum and the cells’ absorption profile limits the efficiency of such devices, while in incandescent light bulbs, most of the energy is lost as heat. One way to avoid the waste of …
View article: Nanoengineered Surfaces for Thermal Energy Conversion
Nanoengineered Surfaces for Thermal Energy Conversion Open
We provide an overview of the impact of using nanostructured surfaces to improve the performance of solar thermophotovoltaic (STPV) energy conversion and condensation systems. We demonstrated STPV system efficiencies of up to 3.2%, compare…
View article: Photonic Crystal Enabled Thermophotovoltaics for a Portable Microgenerator
Photonic Crystal Enabled Thermophotovoltaics for a Portable Microgenerator Open
This work presents the design and characterization of a first-of-a-kind millimeter- scale thermophotovoltaic (TPV) system using a metallic microburner, photonic crystal emitter, and low-bandgap photovoltaic (PV) cells. In our TPV system, c…
View article: Prototype of radioisotope thermophotovoltaic system using photonic crystal spectral control
Prototype of radioisotope thermophotovoltaic system using photonic crystal spectral control Open
This work describes a prototype of a small-size radioisotope thermophotovoltaic (RTPV) system with the two-dimensional metallic photonic crystal emitter and the low bandgap TPV cell. The project demonstrates the simulation and measurement …
View article: Photonic Crystal Emitters for Thermophotovoltaic Energy Conversion
Photonic Crystal Emitters for Thermophotovoltaic Energy Conversion Open
This paper reports the design, fabrication, and characterization of 2D photonic crystal (PhC) thermal emitters for a millimeter-scale hydrocarbon TPV microgenerator as a possible replacement for batteries in portable microelectronics, robo…
View article: Photonic Crystal Enabled Thermophotovoltaics for a Portable Microgenerator
Photonic Crystal Enabled Thermophotovoltaics for a Portable Microgenerator Open
This work presents the design and characterization of a first-of-a-kind millimeter- scale thermophotovoltaic (TPV) system using a metallic microburner, photonic crystal emitter, and low-bandgap photovoltaic (PV) cells. In our TPV system, c…
View article: Nanoengineered Surfaces for Thermal Energy Conversion
Nanoengineered Surfaces for Thermal Energy Conversion Open
We provide an overview of the impact of using nanostructured surfaces to improve the performance of solar thermophotovoltaic (STPV) energy conversion and condensation systems. We demonstrated STPV system efficiencies of up to 3.2%, compare…
View article: Prototype of radioisotope thermophotovoltaic system using photonic crystal spectral control
Prototype of radioisotope thermophotovoltaic system using photonic crystal spectral control Open
This work describes a prototype of a small-size radioisotope thermophotovoltaic (RTPV) system with the two-dimensional metallic photonic crystal emitter and the low bandgap TPV cell. The project demonstrates the simulation and measurement …
View article: Thick sputtered tantalum coatings for high-temperature energy conversion applications
Thick sputtered tantalum coatings for high-temperature energy conversion applications Open
Thick sputtered tantalum (Ta) coatings on polished Inconel were investigated as a potential replacement for bulk refractory metal substrates used for high-temperature emitters and absorbers in thermophotovoltaic energy conversion applicati…
View article: Nanoimprinted superlattice metallic photonic crystal as ultraselective solar absorber
Nanoimprinted superlattice metallic photonic crystal as ultraselective solar absorber Open
Here, a two-dimensional superlattice metallic photonic crystal (PhC) and its fabrication by nanoimprint lithography on tantalum substrates are presented. The superior tailoring capacity of the superlattice PhC geometry is used to achieve s…