scholarly journals Wavefront shaping assisted design of spectral splitters and solar concentrators

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Berk N. Gün ◽  
Emre Yüce
Keyword(s):  
Experimental Method ◽  
Spatial Light Modulator ◽  
Large Scale ◽  
Low Cost ◽  
Optical Element ◽  
Light Modulator ◽  
Solar Concentrators ◽  
Spectral Splitting ◽  
Wavefront Shaping ◽  
First Time

AbstractSpectral splitters, as well as solar concentrators, are commonly designed and optimized using numerical methods. Here, we present an experimental method to spectrally split and concentrate broadband light (420–875 nm) via wavefront shaping. We manage to spatially control white light using a phase-only spatial light modulator. As a result, we are able to split and concentrate three frequency bands, namely red (560–875 nm), green (425–620 nm), and blue (420–535 nm), to two target spots with a total enhancement factor of 715%. Despite the significant overlap between the color channels, we obtain spectral splitting ratios as 52%, 57%, and 66% for red, green, and blue channels, respectively. We show that a higher number of adjustable superpixels ensures higher spectral splitting and concentration. We provide the methods to convert an optimized phase pattern into a diffractive optical element that can be fabricated at large scale and low cost. The experimental method that we introduce, for the first time, enables the optimization and design of SpliCons, which is $$\sim 300$$ ∼ 300 times faster compared to the computational methods.

Optimal trap velocity in a dynamic holographic optical trap using a nematic liquid crystal spatial light modulator

2022 ◽  
Author(s):  
Karuna Sindhu Malik ◽  
Bosanta Ranjan Boruah
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Spatial Light Modulator ◽  
Optical Trap ◽  
Optical Element ◽  
Optical Traps ◽  
Light Modulator ◽  
Step Size ◽  
Microscopic Object ◽  
Optimal Velocity

Abstract A dynamic holographic optical trap uses a dynamic diffractive optical element such as a liquid crystal spatial light modulator to realize one or more optical traps with independent controls. Such holographic optical traps provide a number of flexibilities and conveniences useful in various applications. One key requirement for such a trap is the ability to move the trapped microscopic object from one point to the other with the optimal velocity. In this paper we develop a nematic liquid crystal spatial light modulator based holographic optical trap and experimentally investigate the optimal velocity feasible for trapped beads of different sizes, in such a trap. Our results show that the achievable velocity of the trapped bead is a function of size of the bead, step size, interval between two steps and power carried by the laser beam. We observe that the refresh rate of a nematic liquid crystal spatial light modulator is sufficient to achieve an optimal velocity approaching the theoretical limit in the respective holographic trap for beads with radius larger than the wavelength of light.

scholarly journals Effect of Protocatechuic Acid on Euglena gracilis Growth and Accumulation of Metabolites

2020 ◽  
Vol 12 (21) ◽  
pp. 9158
Author(s):  
Xiaomiao Tan ◽  
Jiangyu Zhu ◽  
Minato Wakisaka
Keyword(s):  
Euglena Gracilis ◽  
Large Scale ◽  
Protocatechuic Acid ◽  
Biomass Yield ◽  
Growth Promotion ◽  
Low Cost ◽  
Cost Effective ◽  
Control Group ◽  
Biological Functions ◽  
First Time

The development of efficient, environmentally friendly, low-cost approaches used to boost the growth of microalgae is urgently required to meet the increasing demands for food supplements, cosmetics, and biofuels. In this study, the growth promotion effects of protocatechuic acid (PCA) in the freshwater microalga Euglena gracilis were confirmed for the first time. PCA is a simple phenolic compound derived from natural plants and has a range of biological functions. The highest biomass yield, 3.1-fold higher than that of the control, used at 1.3 g·L−1, was obtained at 800 mg·L−1 of PCA. The yields of the metabolites chlorophyll a, carotenoids, and paramylon in the presence of PCA at 800 mg·L−1 were 3.1, 3.3, and 1.7 times higher than those of the control group, respectively. The highest paramylon yield was achieved at a lower dosage of PCA (100 mg·L−1), which is considered to be feasible for economic paramylon production. The growth and biosynthesis of metabolites stimulated by phytochemicals such as PCA could be an efficient and cost-effective strategy to enhance the productivity of microalgae in large-scale cultivations.

Using the spatial light modulator as a binary optical element: application to spatial beam shaping for high-power lasers

2018 ◽  
Vol 57 (24) ◽  
pp. 7060 ◽  
Author(s):  
Sensen Li ◽  
Lei Ding ◽  
Pengyuan Du ◽  
Zhiwei Lu ◽  
Yulei Wang ◽  
...  
Keyword(s):  
High Power ◽  
Spatial Light Modulator ◽  
Optical Element ◽  
Beam Shaping ◽  
Light Modulator ◽  
High Power Lasers ◽  
Spatial Beam

scholarly journals Sodium Induced Morphological Changes of Carbon Coated TiO2 Anatase Nanoparticles – High-Performance Materials for Na-Ion Batteries

MRS Advances ◽  
2020 ◽  
Vol 5 (43) ◽  
pp. 2221-2229
Author(s):  
G. Greco ◽  
S. Passerini
Keyword(s):  
Large Scale ◽  
Morphological Changes ◽  
Low Cost ◽  
Cell Structure ◽  
Active Material ◽  
Lithium Ion ◽  
Composite Electrodes ◽  
Carbon Coated ◽  
Anatase Nanoparticles ◽  
First Time

AbstractThe most promising candidate as an everyday alternative to lithium-ion batteries (LIBs) are sodium-ion batteries (NIBs). This is not only due to Na abundance, but also because the main principles and cell structure are very similar to LIBs. Due to these benefits, NIBs are expected to be used in applications related to large-scale energy storage systems and other applications not requiring top-performance in terms of volumetric capacity. One important issue that has hindered the large scale application of NIBs is the anode material. Graphite and silicon, which have been widely applied as anodes in NIBs, do not show great performance. Hard carbons look very promising in terms of their abundance and low cost, but they tend to suffer from instability, in particular over the long term. In this work we explore a carbon-coated TiO2 nanoparticle system that looks very promising in terms of stability, abundance, low-cost, and most importantly that safety of the cell, since it does not suffer from potential sodium plating during cycling. Maintaining a nano-size and consistent morphology of the active material is a crucial parameter for maintaining a well-functioning cell upon cycling. In this work we applied Anomalous Small Angle X-Ray Scattering (ASAXS) for the first time at the Ti K-edge of TiO2 anatase nanoparticles on different cycled composite electrodes in order to have a complete morphological overview of the modifications induced by sodiation and desodiation. This work also demonstrates for the first time that the nanosize of the TiO2 is maintained upon cycling, which is in agreement with the electrochemical stability.

scholarly journals A comparative study of optimization algorithms for wavefront shaping

2019 ◽  
Vol 12 (04) ◽  
pp. 1942002 ◽  
Author(s):  
Zahra Fayyaz ◽  
Nafiseh Mohammadian ◽  
M. Reza Rahimi Tabar ◽  
Rayyan Manwar ◽  
Kamran Avanaki
Keyword(s):  
Comparative Study ◽  
Spatial Light Modulator ◽  
Scattered Light ◽  
Optimization Algorithms ◽  
Estimation Method ◽  
Noise Levels ◽  
Light Modulator ◽  
Matrix Estimation ◽  
Phase Map ◽  
Wavefront Shaping

By manipulating the phase map of a wavefront of light using a spatial light modulator, the scattered light can be sharply focused on a specific target. Several iterative optimization algorithms for obtaining the optimum phase map have been explored. However, there has not been a comparative study on the performance of these algorithms. In this paper, six optimization algorithms for wavefront shaping including continuous sequential, partitioning algorithm, transmission matrix estimation method, particle swarm optimization, genetic algorithm (GA), and simulated annealing (SA) are discussed and compared based on their efficiency when introduced with various measurement noise levels.

High-Resolution Correction of Arbitrary Wavefront Aberration Using Liquid Crystal Spatial Light Modulator

2011 ◽  
Vol 121-126 ◽  
pp. 877-881
Author(s):  
Hong Xin Zhang ◽  
Xiao Xi Xu
Keyword(s):  
Liquid Crystal ◽  
High Resolution ◽  
Spatial Light Modulator ◽  
Low Cost ◽  
Phase Conjugation ◽  
Astronomical Observation ◽  
Wavefront Aberration ◽  
Strehl Ratio ◽  
Light Modulator ◽  
Wavefront Correction

Wavefront correction plays significant role in some fields like astronomical observation, laser processing and medical imaging, etc. Liquid crystal spatial light modulator ( LC SLM) is an ideal device for high-resolution wavefront correction because of its low cost, low consumption, large number of pixels and independent programming control of each unit. It is researched experimentally that LC SLM is used as a wavefront correction device and corrects arbitrary wavefront aberration. Wavefront correction is performed based on phase conjugation and periodic phase modulation with modulo-2π. The experimental results show that the PV value of the irregular wavefront aberration is 1.56λ, RMS value is 0.25 and Strehl ratio is 0.08 before correction, but the PV value of the residual aberration is reduced to 0.26λ, RMS value is 0.02 and Strehl ratio is increased to 0.97 which is approximated diffraction limit after correction. It is proved to be feasible and effective that LC SLM is used to the high-precision and high-resolution wavefront correction.

Large-scale holographic switch with a ferroelectric liquid-crystal spatial light modulator

1998 ◽  
Vol 213 (1) ◽  
pp. 225-232 ◽  
Author(s):  
Hirofumi Yamazaki ◽  
Tohru Matsunaga ◽  
Seiji Fukushima ◽  
Takashi Kurokawa
Keyword(s):  
Liquid Crystal ◽  
Spatial Light Modulator ◽  
Large Scale ◽  
Ferroelectric Liquid Crystal ◽  
Light Modulator

scholarly journals Antiferromagnetic spatial photonic Ising machine through optoelectronic correlation computing

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Junyi Huang ◽  
Yisheng Fang ◽  
Zhichao Ruan
Keyword(s):  
Spatial Light Modulator ◽  
Large Scale ◽  
Single Phase ◽  
Optimization Problems ◽  
Light Modulator ◽  
Practical Applications ◽  
Combinatorial Optimization Problems ◽  
Partitioning Problem ◽  
Statistical Systems ◽  
Antiferromagnetic Model

AbstractRecently, spatial photonic Ising machines (SPIM) have been demonstrated to compute the minima of Hamiltonians for large-scale spin systems. Here we propose to implement an antiferromagnetic model through optoelectronic correlation computing with SPIM. Also we exploit the gauge transformation which enables encoding the spins and the interaction strengths in a single phase-only spatial light modulator. With a simple setup, we experimentally show the ground-state-search acceleration of an antiferromagnetic model with 40000 spins in number-partitioning problem. Thus such an optoelectronic computing exhibits great programmability and scalability for the practical applications of studying statistical systems and combinatorial optimization problems.

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