Control of spatial phase empowering spectral splitting and concentration of solar spectrum

Harvesting energy from a broad-spectrum light with high efficiency is a long-standing endeavor given the increasingly important energy source yet to be exploited further: sunlight. No material alone can derive energy from a broadband light with high efficiency. That being the case, the methods benefitting from spectral sub-bands together with concentration are in demand to utilize record level efficiency in photovoltaic cells. It is possible to get these sub-bands by portioning a broadband light through spectral splitting. Spectral splitters are generally realized via computational methods. Here, we present an experimental method to spectrally split and concentrate broadband light via controlling the wavefront of the incident light. We have chosen particular concentration spots for red (560 nm - 875 nm), green (425 nm – 620 nm), and blue (420 nm – 535 nm) frequency bands within the broad-spectrum. Encoding different diffractive patterns onto the SLM, we manage to generate dynamic phase plates that enable experimental control on the spatial phase of the incident light. The concentration of light is achieved with a total enhancement factor of 564 %. The spectral splitting ratios that we obtain are 43 %, 37 % and 34 % for red, green, and blue channels, respectively. The method that we offer is faster than the computational methods given the fast response time of the spatial light modulator within 17 ms. This duration is much shorter than the time spent for calculating diffractive optical elements. We provide an experimental method that can increase the impact of diffractive optical elements (DOE) by providing the means to design efficient and effective DOEs within a very short time. Thereby, the output intensity profile of light that passes through the phase plate is measured and altered within this short duration providing a faster total computational time than a calculation of the output intensity distribution at the target plane. This study is financially supported by The Scientific and Technological Research Council of Turkey (TÜBİTAK), grant no 118F075.
PVCON 2020


Simulation of geothermal reservoirs with high amount of carbon dioxide
Küçük, Serhat; Akın, Serhat; Department of Petroleum and Natural Gas Engineering (2018)
Geothermal energy is always attributed as a sustainable and environmentally friendly source of energy. But in some cases, amount of the greenhouse gas emissions from geothermal fields become a big issue. Kızıldere Geothermal Field, one of the most important and large scale geothermal fields of the world, is a subject of these issues, experiencing excess amount of CO2 production rates and a rapid decline in the reservoir pressures. This study aims to construct a numerical model of the Kızıldere Geothermal Fi...
Optimization of energy harvesting wireless communication systems
Erkal, Hakan; Uysal Bıyıkoğlu, Elif; Department of Electrical and Electronics Engineering (2011)
In an energy harvesting communication system, energy is derived from outside sources and becomes partially available at different points in time. The constraints induced by this property on energy consumption plays an active role in the design of efficient communication systems. This thesis focuses on the optimal design of transmission and networking schemes for energy harvesting wireless communication systems. In particular, an energy harvesting transmitter broadcasting data to two receivers in an AWGN bro...
Investigation of structural and electrochemical properties of biomass based activated carbon materials for energy storage applications
Köse, Kadir Özgün; Aydınol, Mehmet Kadri; Department of Metallurgical and Materials Engineering (2017)
Finding new energy sources and efficient ways for energy storage is one of the primary goals in both scientific and industrial research. To achieve this purpose, studies are concentrated on optimizing the characteristics of energy storage devices such as batteries, fuel cells and supercapacitors. Activated carbon (AC), beside its versatile application areas including wastewater and gas treatment, is used as electrodes in electrical double layer capacitors and as cathode in metal air batteries due to its hig...
Evaluation of geothermal potential of Turkey using GIS based multi criteria analysis
Öztürk, Şafak; Kaymakcı, Nuretdin; Department of Geological Engineering (2019)
Geothermal energy could meet more than the world’s energy need. However, a very small amount of this energy is utilized by humanity, due to drilling and exploration costs for deep resources. Therefore, prospective studies have great importance in order to reduce the cost for exploration and utilization of geothermal energy. In this study Geographic Information System (GIS) based geothermal assessment techniques are used to determine the promising areas in Turkey. GIS is a combination of three features; oper...
Analytical Modelling, Simulation and Comparative Study of Multi-Junction Solar Cells Efficiency
Hadjdida, Abdelkader; Bourahla, Mohamed; Ertan, Hulusi Bülent; Bekhti, Mohamed (2018-12-01)
Currently, solar energy is promising the primary source of renewable energy that has a great potential to generate power for an extremely low operating cost when compared to already existing power generation technologies. Increasing the efficiency of solar cells is a major goal and the prominent factor in photovoltaic system research. Current triple junction solar cells reach 30% and the next generation will bring 35% in 5 years to peak at 40%. These cells are used in space environment and in terrestrial sy...
Citation Formats
B. N. Gün and E. Yüce, “Control of spatial phase empowering spectral splitting and concentration of solar spectrum,” presented at the PVCON 2020, Ankara, Türkiye, 2020, Accessed: 00, 2021. [Online]. Available: