ANALYSIS OF CORRELATION FUNCTION AND POLARIZATION ENTANGLEMENT OF PHOTON PAIRS GENERATED FROM ANISOTROPIC SEMICONDUCTOR QUANTUM DOT

2008 ◽  
Vol 06 (04) ◽  
pp. 959-973
Author(s):  
SHAO-DING LIU ◽  
MU-TIAN CHENG ◽  
XIA WANG ◽  
QU-QUAN WANG
Keyword(s):  
Density Matrix ◽  
Input Pulse ◽  
Pulse Excitation ◽  
Energy Splitting ◽  
Spectral Filter ◽  
Pulse Area ◽  
Spectral Filters ◽  
Filter Width ◽  
Photon Pairs ◽  
Regression Theorem

The dynamics of the population density matrix and polarization density matrix of the biexciton system of single semiconductor quantum dots with pulse excitation were analyzed by using master equations and quantum regression theorem. A model based on the spectral distributions of the cascade photon emissions was proposed to calculate the polarization entanglement of the photon pairs emitted from the non-degenerate biexciton system with spectral filters. The influences of the spectral filter width and the exciton energy splitting between the two orthogonally polarized eigenstates on the entanglement were theoretically analyzed. The dependence of the polarization entanglement on the input pulse area was also discussed.

Growth Response and Carbohydrate Status of Gibberellin-treated Spectral Filter-grown Chrysanthemum Plants

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 522c-522
Author(s):  
Anuradha Tatineni ◽  
Sonja L. Maki ◽  
Nihal C. Rajapakse
Keyword(s):  
Plant Height ◽  
Growth Regulation ◽  
Red Light ◽  
Sucrose Phosphate Synthase ◽  
Spectral Filter ◽  
Spectral Filters ◽  
Wide Range ◽  
Ornamental Crops ◽  
Carbohydrate Levels ◽  
Carbohydrate Status

Interest in the use of non- (or less) chemical methods to reduce the height of ornamental crops has increased tremendously. Manipulation of greenhouse light quality is one alternative for plant growth regulation. We have shown that eliminating far-red light from the greenhouse environment with liquid CuSO4 spectral filters is effective in reducing the height of a wide range of plants though plant carbohydrate status is also altered under CuSO4 filter. In previous studies, application of GA3 reversed both the reduction of plant height and carbohydrate status of CuSO4 spectral filter grown plants. It has been proposed that GAs enhance the activity of the enzyme sucrose phosphate synthase to regulate carbohydrate levels. In the present study the role of exogenously applied GA19, GA1, and GA3 in overcoming the reduction of plant height and carbohydrate levels was investigated. Chrysanthemum plants were treated weekly for 4 weeks with saturating doses of GA19, GA1 and GA3 (25 μg) or the growth retardants paclobutrazol and prohexadione. GA1 was also applied with paclobutrazol and prohexadione to assess whether response to GAs is altered under CuSO4 filter. GA1 and GA3 promoted growth similarly under control or CuSO4 filter. GA19 was least effective in promoting growth under CuSO4 filter. In summary, these results suggest that gibberellin physiology is altered under spectral filters with the conversion of GA19 a possible point of regulation. The correlation between the carbohydrate status and the growth of the plants will be discussed.

scholarly journals CARBOHYDRATE STATUS OF CUSO4 SPECTRAL FILTER-GROWN CHRYSANTHEMUM PLANTS

HortScience ◽  
1996 ◽  
Vol 31 (5) ◽  
pp. 745d-745
Author(s):  
Venkat K. Reddy ◽  
Nihal C. Rajapakse
Keyword(s):  
Plant Height ◽  
Transmitted Light ◽  
Internode Length ◽  
Spectral Filter ◽  
Water Control ◽  
Spectral Filters ◽  
Light Passing ◽  
Carbohydrate Levels ◽  
Carbohydrate Status ◽  
The Relationship

The response of `Bright Golden Anne' chrysanthemum plants grown under CuSO4 spectral filters to exogenous GA3 application was evaluated to determine the relationship between gibberellins (GAs) and carbohydrate levels. The CuSO4 filters removed far red (FR) wavelengths of light and increased red: far red (R:FR), blue: far red (B:FR), blue: red (B:R) ratios, and phytochrome photoequilibrium (Ø) values of transmitted light compared to water (control) filter. Plant height, internode length, and leaf and stem dry weights were significantly reduced by light passing through CuSO4 filters in spring and summer seasons. Weekly applications of exogenous GA3 reversed the reduction in height and internode length induced by CuSO4 filters. Plants grown under CuSO4 filters responded more to exogenous GA3 application with respect to height and internode length, suggesting that the sensitivity to GA was not lowered. Light passing through CuSO4 filters reduced the carbohydrate levels, but the response varied with the season. Weekly GA3 application increased the carbohydrate levels, but did not totally reverse the reduction in carbohydrate levels under the CuSO4 filters. Although GA3 application increased the carbohydrate levels partially in CuSO4 filter-grown plants, the inhibition of GAs may not be solely responsible for reduction of carbohydrate levels under CuSO4 filters, showing that exogenous GAs and carbohydrate levels are not well correlated under CuSO4 spectral filters.

scholarly journals Spectral Filter Selection for Increasing Chromatic Diversity in CVD Subjects

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 2023 ◽  
Author(s):  
Miguel Ángel Martínez-Domingo ◽  
Eva M. Valero ◽  
Luis Gómez-Robledo ◽  
Rafael Huertas ◽  
Javier Hernández-Andrés
Keyword(s):  
Color Vision ◽  
Color Blindness ◽  
Normal Observer ◽  
Computational Simulations ◽  
Spectral Filter ◽  
Color Vision Deficiency ◽  
Spectral Filters ◽  
Normal Color Vision ◽  
Selection For ◽  
Color Filters

This paper analyzes, through computational simulations, which spectral filters increase the number of discernible colors (NODC) of subjects with normal color vision, as well as red–green anomalous trichromats and dichromats. The filters are selected from a set of filters in which we have modeled spectral transmittances. With the selected filters we have carried out simulations performed using the spectral reflectances captured either by a hyperspectral camera or by a spectrometer. We have also studied the effects of these filters on color coordinates. Finally, we have simulated the results of two widely used color blindness tests: Ishihara and Farnsworth–Munsell 100 Hue (FM100). In these analyses the selected filters are compared with the commercial filters from EnChroma and VINO companies. The results show that the increase in NODC with the selected filters is not relevant. The simulation results show that none of these chosen filters help color vision deficiency (CVD) subjects to pass the set of color blindness tests studied. These results obtained using standard colorimetry support the hypothesis that the use of color filters does not cause CVDs to have a perception similar to that of a normal observer.

Considering spectral variability for optical material abundance estimation

2018 ◽  
Vol 85 (3) ◽  
pp. 149-158 ◽  
Author(s):  
Wolfgang Krippner ◽  
Sebastian Bauer ◽  
Fernando Puente León
Keyword(s):  
Large Degree ◽  
Hyperspectral Images ◽  
Spectral Filter ◽  
Negative Effects ◽  
Spectral Variability ◽  
Image Encoding ◽  
Spectral Filters ◽  
Abundance Estimates ◽  
Specific Material

Abstract Hyperspectral images include information enabling the determination of material abundances. Due to the fact that the acquisition of hyperspectral images is time consuming and the processing of these images is computationally costly, we propose an optical approach using spectral filters to retrieve the material abundances. The application of a spectral filter leads to an intensity image encoding estimates for the abundances of a specific material. The acquisition and processing of hyperspectral images becomes superfluous. However, the determination of spectral filters offers a large degree of freedom. In this work, we focus on methods for designing spectral filters incorporating spectral variability. Particularly, we account for reducing the negative effects of spectral variability on the accuracy of estimates for material abundances. According to experimental evaluations, we conclude that including spectral variability into the calculation of spectral filters leads to more accurate abundance estimates when mixed spectra of the considered material mixtures sufficiently fulfill the linear mixing model.

scholarly journals The Impact of the Spectral Filter Bandwidth on the Spectral Entanglement and Indistinguishability of Photon Pairs of SPDC Process

2018 ◽  
Vol 12 (2) ◽  
pp. 119-128
Author(s):  
Ali Mohammadi ◽  
Atoosa Sadat Arabanian ◽  
Ali Dalafi ◽  
◽  
◽  
...  
Keyword(s):  
Spectral Filter ◽  
Filter Bandwidth ◽  
Photon Pairs ◽  
The Impact

scholarly journals Multi-composing of the ordinates as a spectral filter

2003 ◽  
pp. 75-80 ◽  
Author(s):  
S. Segan ◽  
Ivana Damjanov ◽  
B. Surlan
Keyword(s):  
Spectral Filter ◽  
Spectral Filters

In this paper we describe a method of plain and multi composing of ordinates to define spectral filters. We apply the method to the simulated equidistant observations, and we find that the suitable filters are easy to construct and apply.

ON SIMULATION OF LOG-PERIODIC WIRE ANTENNA WITH PULSE EXCITATION AT SHORT RANGES

2013 ◽  
Vol 72 (9) ◽  
pp. 767-775
Author(s):  
M. A. Omarov ◽  
S. N. Selevko ◽  
R. I. Tsekhmistro ◽  
A. V. Degtyarev
Keyword(s):  
Wire Antenna ◽  
Pulse Excitation
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