Article
Energy & Fuels
Leonardo Faustino Lacerda de Souza, Naum Fraidenraich, Chigueru Tiba, Jeffrey M. Gordon
Summary: The linear aplanatic Fresnel reflector (LAFR) is a novel optical design suitable for solar thermal power plants, combining a segmented primary reflector with a stationary secondary mirror and receiver. By eliminating geometric aberrations, it achieves high-efficiency light concentration and high intercept factors.
Article
Energy & Fuels
Leonardo F. L. de Souza, Naum Fraidenraich, Chigueru Tiba, Jeffrey M. Gordon
Summary: Linear Aplanatic Fresnel Reflectors (LAFRs) have been introduced as a new and viable dual-mirror solar concentrator. Analytic methods for all inherent optical losses in the LAFR have been presented, allowing rapid comparisons among a wide range of possible designs. The results show LAFR designs with higher intercept factor and higher concentration, surpassing the previously determined ones.
Article
Engineering, Aerospace
Vladislav V. Druzhin, Daniil T. Puryaev
Summary: This paper proposes an optical system of the telescope for space research, consisting of a segmented spherical mirror with a diameter of 10 m and a secondary aspherical mirror. The system's focal length is equal to the radius of the primary mirror, and it rigorously satisfies the Abbe sine condition.
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
(2021)
Article
Optics
Pablo Benitez, Milena Nikolic, Juan C. Minano, Mithra Anand, Asuncion Santamaria
Summary: Second-order semi-aplanatism improves imaging quality, particularly for high aspect ratio sensors. Designing such optical devices involves the use of freeform surfaces and a specific algorithm.
Article
Astronomy & Astrophysics
V. Yu Terebizh
Summary: This article provides a detailed description of two-mirror telescopes with a flat medial focal surface, focusing on aplanats for wider field of view. Solutions for Schwarzschild and Gregorian telescopes are addressed, allowing for the use of flat light detectors. New designs are particularly useful for minimizing the number of reflective surfaces needed, especially in space exploration and non-optical observations.
EXPERIMENTAL ASTRONOMY
(2022)
Article
Optics
Michelle C. Rocha, Alexander Goncharov
Summary: In this study, an analytically designed meniscus lens is proposed as a field corrector for RC telescopes, which increases the field of view without affecting the telescope's aplanatic properties and mirror shape.
Article
Optics
Alberto Silva-Lora, Rafael Torres
Summary: It has been found that certain families of Cartesian surfaces form exactly aplanatic systems that are free of spherical aberration and coma. Through studying different types of systems, it was observed that rigorous aplanatism occurs for objects and images on curved surfaces.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2021)
Article
Optics
Shlomi Steinberg, Nandor Bokor, Nir Davidson
Summary: This paper introduces a simple and compact two-mirror system for diffuse light concentration. The design principle is based on local conservation of optical brightness. The system design is flexible, allowing for computation of mirror shapes based on arbitrary incident beam direction and target cross-sectional shape. Experimental results confirm the efficient diffuse light concentration of the system close to the thermodynamic limit.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2022)
Article
Nanoscience & Nanotechnology
Gerd Leuchs, Alexey Andrianov, Elena A. Anashkina, Alina A. Manshina, Peter Banzer, Markus Sondermann
Summary: Concentrating light requires suitable polarization patterns and 4 pi solid angle geometry for effective coupling with nanostructures. Cylindrical vector beams with specific patterns can be used to study nanostructures. The discussion also covers topics such as ultimate diffraction limit, resonant field enhancement, and nonresonant field enhancement.
Article
Energy & Fuels
Johannes M. Greulich, Wiebke Wirtz, Hannes Hoeffler, Nico Woehrle, Mattias K. Juhl, Oliver Kunz, Stefan Rein, Andreas W. Bett
Summary: The study introduces a contactless method for determining the IV characteristics of silicon solar cells and proves its effectiveness through experiments. This method reduces mechanical stress, silver consumption, and time required, while providing additional information compared to conventional testing.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Energy & Fuels
A. Moreno, D. Chemisana, E. F. Fernandez
Summary: The study designed a high-concentration PVT module and simulated it in two representative cities in Spain and the United States. The results showed that the module performed well, meeting 95% to 100% of domestic hot water demand and over 55% of space heating, cooling, and electricity demand. The comparison with a standard PVT solar collector indicated that the HCPVT system clearly outperformed in terms of electricity and thermal energy production.
Article
Optics
Rafael G. Gonzalez-Acuna
Summary: This paper presents an exact partial differential equation for designing aplanatic freeform-mirror-based optical systems. The equation is not limited by the number or orientation of the freeform surfaces. The solutions of this equation can serve as initial setups that can be optimized to meet higher criteria. One of these solutions is tested as an example, and the results match the theory.
Article
Engineering, Environmental
Panpan Wang, Chao Xu, Xin Zhang, Qiaoxia Yuan
Summary: This study developed a solar evaporation system for the concentration of liquid digestate (LD) in a cost-effective and efficient manner with high nutrient recovery. It investigated the effects of solar radiation, LD flowrate, and daily treatment capacity on the concentration efficiency, nutrient recovery, and thermal efficiency. Economic and enviroeconomic analyses demonstrated the feasibility and environmental benefits of the system for large-scale biogas plants.
Article
Energy & Fuels
Tudor E. Scheul, Edris Khorani, Tasmiat Rahman, Martin D. B. Charlton, Stuart A. Boden
Summary: The study utilized wavelength and angle resolved scattering (WARS) reflectance measurements on b-Si surfaces to analyze light scattering effects. It was found that large angle scattering occurs across the entire spectrum, especially for shorter wavelengths and taller texture features, resulting in significant light trapping through total internal reflectance (TIR) at various interfaces. This led to a calculated additional boost of up to 0.45% in the photogenerated current of encapsulated black silicon solar cells.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Optics
Rafael G. Gonzalez-Acuna
Summary: The paper presents the exact differential equations for designing an aplanatic sequential optical system free of spherical aberration and linear coma. The equations are derived from the Fermat principle and the Abbe sine condition, and solved using the Runge-Kutta algorithm. The solutions are tested with commercial ray-tracing software to confirm the expected behavior of the optical system.
