16 results on '"De-Qin Xu"'
Search Results
2. Demonstration of correlated imaging enhancement with divergence enlargement algorithms
- Author
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Xin-Bing Song, Ling-Yu Dou, De-Zhong Cao, and De-Qin Xu
- Subjects
Physics ,Path (topology) ,media_common.quotation_subject ,02 engineering and technology ,Function (mathematics) ,Ghost imaging ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Intensity (physics) ,Exponential function ,010309 optics ,0103 physical sciences ,Contrast (vision) ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,0210 nano-technology ,Divergence (statistics) ,Power function ,Algorithm ,media_common - Abstract
We propose advanced image enhancement algorithms for conventional ghost imaging. The algorithms are based on modulating the bucket signals to enlarge their divergence. In this paper, we adopt three mathematical functions: power function like f ( B ) = B n , exponential function like f ( B ) = exp ( p ⋅ B ) , and self modulation function like f ( B ) = B q ⋅ B , where B is the bucket intensity in the object path. Our experimental results demonstrate the enhancement of the contrast of the correlated images with these algorithms.
- Published
- 2019
3. Electromagnetically induced classical and quantum Lau effect
- Author
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Guo-Jian Yang, Jun Xiong, De-Qin Xu, and Tianhui Qiu
- Subjects
Physics ,Mathematics::Functional Analysis ,business.industry ,Electromagnetically induced transparency ,Electromagnetically induced grating ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Coincidence ,Electronic, Optical and Magnetic Materials ,010309 optics ,Optics ,Photon entanglement ,Quantum mechanics ,0103 physical sciences ,Thermal ,Physics::Atomic Physics ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,010306 general physics ,business ,Quantum - Abstract
We present two schemes of Lau effect for an object, an electromagnetically induced grating generated based on the electromagnetically induced effect. The Lau interference pattern is detected either directly in the way of the traditional Lau effect measurement with a classical thermal light being the imaging light, or indirectly and nonlocally in the way of two-photon coincidence measurement with a pair of entangled photons being the imaging light.
- Published
- 2016
4. Displacement measurement in a Sagnac interferometer with thermal light second-order correlation
- Author
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Ling-Yu Dou, De-Qin Xu, De-Zhong Cao, and Xin-Bing Song
- Subjects
Diffraction ,Physics ,genetic structures ,business.industry ,food and beverages ,01 natural sciences ,Slit ,eye diseases ,Atomic and Molecular Physics, and Optics ,Ptychography ,Displacement (vector) ,010309 optics ,Optical axis ,Interferometry ,Optics ,0103 physical sciences ,Reflection (physics) ,sense organs ,Electrical and Electronic Engineering ,business ,Engineering (miscellaneous) ,Beam (structure) - Abstract
We report a displacement measurement experiment in second-order correlation and subwavelength correlation with thermal light. Our target is a single slit, which is inserted into a Sagnac interferometer to mimic a double-slit apparatus. According to the correlated diffraction pattern, we can predict the excursion of the slit from the optical axis. When the slit is shifted, we can predict the displacement accurately. We also present the mathematical presentations of beam propagation and reflection in comprehensive deduction.
- Published
- 2020
5. Near field and far field correlations of thermal light
- Author
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Kaige Wang, De-Qin Xu, Jiao-Jiao Zhao, De-Jian Zhang, Jun Xiong, Hai-Bo Wang, and Hong-Guo Li
- Subjects
Diffraction ,Physics ,Photon ,business.industry ,Near and far field ,Ghost imaging ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Transverse plane ,Optics ,Position (vector) ,Thermal ,Wave vector ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,business - Abstract
We present theoretical analysis and experimental demonstration of near field and far field spatial correlations of thermal light. Similar to the inequality Δ x − Δ p + 1 for a two-photon entangled source, we obtain an inequality Δ x − Δ p − 1 which also concerns both photon position and transverse wavevector correlations of thermal light. To test this inequality, we carry out an experiment in which ghost diffraction and ghost imaging can be simultaneously observed without the aid of any lenses. Meanwhile, the inequality is examined experimentally.
- Published
- 2014
6. Second-order Lau effect with pseudo-thermal light
- Author
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De-Jian Zhang, Jun Xiong, Hong-Guo Li, Jiao-Jiao Zhao, Xin-Bing Song, Hai-Bo Wang, De-Qin Xu, and Kaige Wang
- Subjects
Physics ,Mathematics::Functional Analysis ,business.industry ,Order (ring theory) ,Near and far field ,Interference (wave propagation) ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Optics ,Thermal ,Physics::Atomic Physics ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,business - Abstract
Lau effect is a self-imaging formed in the far field of a pair of gratings illuminated by spatially incoherent light. We report the experimental demonstration of the second-order Lau effect with incoherently pseudo-thermal light. Spatially periodic structures were nonlocally superposed giving rise to interference patterns in intensity correlation measurement. The experimental results are in agreement with the theoretical analysis. The second-order Lau effect can be well understood by the unfolded version of the experimental setup where the bucket detection can be thought as the incoherent illumination in classical Lau effect.
- Published
- 2013
7. Improved Gastrodin Production of Biotransformation Conditions by Cultured Cells Armillaria luteo-virens Sacc and the Anti-inflammatory Activity In Vivo
- Author
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Qi-He Chen, Niu Yongwu, Li Hongji, De-Qin Xu, and Ya-Chen Dong
- Subjects
Chromatography ,Bioconversion ,Chemistry ,medicine.drug_class ,Stereochemistry ,Kinetics ,Anti-inflammatory ,chemistry.chemical_compound ,Biotransformation ,In vivo ,Biocatalysis ,medicine ,Gastrodin ,Response surface methodology - Abstract
Gastrodin (GAS), the main bioactive component of G. elata Blume, has important pharmaceutical and functional activities. The aim of this study is to produce GAS from p-2-hydroxybenzyl alcohol (HBA) through biotransformation. The conversion of exogenous HBA into GAS compound was conducted using cell suspension cultures of Armillaria luteo-virens Sacc. The bioconversion conditions were fully optimized with response surface methodology (RSM), turning out that the optimal transformation conditions composed of 3 mg/mL HBA, 6.5 g/30 mL inoculums level, 1.5% Tween 80, pH 4.5, and transformation temperature at 23°C. Under the optimized conditions, the conversion productivity of GAS reached the highest value (5.65 ± 0.45 mg/L). Verified experiments further validated that the optimized conditions were suitable for predicting the actual process of HBA transformation in the resting-cell system. The bioconversion kinetics model was as well simulated with Michaelis–Menten equation, which showing the suitability. The present study proposed the biotransformation pathway of HBA into GAS by resting cells transformation, indicating that the biotransformation process involved glucosylation reaction. Furthermore, Imprinting Control Region (ICR) mice in vivo demonstrated that the identified gastrodin possessed a significant anti-inflammatory activity. The fundamental data in the present work provides an efficient way to produce GAS through the whole-cells biocatalysis.
- Published
- 2016
8. Ghost imaging via optical parametric amplification
- Author
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De-Jian Zhang, Jun Xiong, Hong-Guo Li, Kaige Wang, Haibo Wang, Sen Wang, De-Qin Xu, and Qiu-Li Zhao
- Subjects
Physics ,Optics ,business.industry ,Ghost imaging ,business ,Optical parametric amplifier ,Atomic and Molecular Physics, and Optics - Published
- 2015
9. Effect of submerged culture conditions on exopolysaccharides production by Armillaria luteo-virens Sacc QH and kinetic modeling
- Author
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Jing Liu, Qi He Chen, Ming Liang Fu, and De Qin Xu
- Subjects
chemistry.chemical_classification ,Armillaria ,biology ,Kinetic model ,Bioengineering ,General Medicine ,Models, Theoretical ,biology.organism_classification ,Polysaccharide ,Culture Media ,Industrial Microbiology ,Kinetics ,Bioreactors ,chemistry ,Polysaccharides ,Botany ,Bioreactor ,Food science ,Aeration rate ,Industrial and production engineering ,Mycelium ,Algorithms ,Biotechnology - Abstract
This work aimed to develop the submerged cultivation conditions for improved exopolysaccharides (EPS) production by Armillaria luteo-virens Sacc. The effects of culture temperature, aeration rate, inoculum level, initial pH, and additives on EPS formation and mycelial growth are investigated. The aeration rate, initial pH, and inoculum level significantly affected EPS production under the submerged cultivation. The developed conditions were as follows: cultivation temperature 23 °C, initial pH 5.0, aeration rate 0.5 vvm, 0.5% Tween 80, inoculum level 5% (v/v), and shaking speed 120 r/min. Under the developed conditions, the highest EPS production was 13.01 g/L at 5 days culture time. EPS production was examined in a 5 L bioreactor, and an unstructured kinetic model for EPS formation was well developed. The verified investigations in the large-scale cultivation system showed that the developed models are able to predict the submerged cultivation process of EPS formation. Current results revealed that the submerged cultivation conditions can be utilized to control EPS production, and the unstructured models developed are suitable for explaining EPS production by A. luteo-virens Sacc QH in a large-scale cultivation bioreactor.
- Published
- 2010
10. Lensless ghost imaging of a phase object with pseudo-thermal light
- Author
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Qiang Tang, Hao-Chuan Qiu, Haibo Wang, Teng-Fei Wu, De-Qin Xu, Kaige Wang, Hong-Guo Li, De-Jian Zhang, and Jun Xiong
- Subjects
Physics ,Physics and Astronomy (miscellaneous) ,business.industry ,media_common.quotation_subject ,Phase (waves) ,Ghost imaging ,Interference (wave propagation) ,Object (computer science) ,High Energy Physics::Theory ,Optics ,Amplitude ,Computer Science::Computer Vision and Pattern Recognition ,Thermal ,Contrast (vision) ,business ,Realization (systems) ,media_common - Abstract
We report an experimental realization of lensless ghost imaging for a phase-only object with pseudo-thermal light, which was proposed by W. Gong and S. Han [Phys. Rev. A 82, 023828 (2010)]. In contrast with conventional ghost imaging, the scheme involves the interference of two correlated fields and the phase information of the object can be retrieved. This imaging technique completes the nonlocally lensless spatial reconstruction of both amplitude and phase distributions in ghost imaging with thermal light.
- Published
- 2014
11. Experimental observation of one-dimensional quantum holographic imaging
- Author
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Haibo Wang, Jun Xiong, Xiangdong Zhang, De-Qin Xu, Kaige Wang, De-Zhong Cao, and Xin-Bing Song
- Subjects
Physics ,Photon ,Physics and Astronomy (miscellaneous) ,business.industry ,Holography ,Physics::Optics ,Quantum entanglement ,Holographic interferometry ,Signal ,law.invention ,Optics ,law ,business ,Image resolution ,Quantum ,Parametric statistics - Abstract
We report the experimental observation of quantum holographic imaging of one-dimensional object with entangled photon pairs, generated in a spontaneous parametric down-conversion process. The signal photons play both roles of “object wave” and “reference wave” in holography but are recorded by a point detector providing only encoding information, while the idler photons travel freely and are locally manipulated with spatial resolution. The holographic image is formed by the two-photon correlation measurement, although both the signal and idler beams are incoherent. Three types of quantum holography schemes are analyzed according to the detection regime of the signal photons.
- Published
- 2013
12. Experimental observation of sub-Rayleigh quantum imaging with a two-photon entangled source.
- Author
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De-Qin Xu, Xin-Bing Song, Hong-Guo Li, De-Jian Zhang, Hai-Bo Wang, Jun Xiong, and Kaige Wang
- Subjects
- *
TWO-photon transition probability , *QUANTUM entanglement , *RAYLEIGH scattering , *IMAGING systems , *FRAUNHOFER diffraction , *WAVELENGTHS - Abstract
It has been theoretically predicted that N-photon quantum imaging can realize either an N-fold resolution improvement (Heisenberg-like scaling) or a √N -fold resolution improvement (standard quantum limit) beyond the Rayleigh diffraction bound, over classical imaging. Here, we report the experimental study on spatial sub-Rayleigh quantum imaging using a two-photon entangled source. Two experimental schemes are proposed and performed. In a Fraunhofer diffraction scheme with a lens, two-photon Airy disk pattern is observed with subwavelength diffraction property. In a lens imaging apparatus, however, two-photon sub-Rayleigh imaging for an object is realized with super-resolution property. The experimental results agree with the theoretical prediction in the two-photon quantum imaging regime. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
13. Lensless ghost imaging of a phase object with pseudo-thermal light.
- Author
-
De-Jian Zhang, Qiang Tang, Teng-Fei Wu, Hao-Chuan Qiu, De-Qin Xu, Hong-Guo Li, Hai-Bo Wang, Jun Xiong, and Kaige Wang
- Subjects
HOLOGRAPHY ,OPTICAL interference ,FIELD theory (Physics) ,PHASE shift (Nuclear physics) ,LIGHT transmission ,INFRARED absorption ,EQUIPMENT & supplies - Abstract
We report an experimental realization of lensless ghost imaging for a phase-only object with pseudo-thermal light, which was proposed by W. Gong and S. Han [Phys. Rev. A 82, 023828 (2010)]. In contrast with conventional ghost imaging, the scheme involves the interference of two correlated fields and the phase information of the object can be retrieved. This imaging technique completes the nonlocally lensless spatial reconstruction of both amplitude and phase distributions in ghost imaging with thermal light. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
14. Effect of submerged culture conditions on exopolysaccharides production by Armillaria luteo- virens Sacc QH and kinetic modeling.
- Author
-
De Qin Xu, Ming Liang Fu, Qi He Chen, and Jing Liu
- Abstract
This work aimed to develop the submerged cultivation conditions for improved exopolysaccharides (EPS) production by Armillaria luteo- virens Sacc. The effects of culture temperature, aeration rate, inoculum level, initial pH, and additives on EPS formation and mycelial growth are investigated. The aeration rate, initial pH, and inoculum level significantly affected EPS production under the submerged cultivation. The developed conditions were as follows: cultivation temperature 23 °C, initial pH 5.0, aeration rate 0.5 vvm, 0.5% Tween 80, inoculum level 5% (v/v), and shaking speed 120 r/min. Under the developed conditions, the highest EPS production was 13.01 g/L at 5 days culture time. EPS production was examined in a 5 L bioreactor, and an unstructured kinetic model for EPS formation was well developed. The verified investigations in the large-scale cultivation system showed that the developed models are able to predict the submerged cultivation process of EPS formation. Current results revealed that the submerged cultivation conditions can be utilized to control EPS production, and the unstructured models developed are suitable for explaining EPS production by A. luteo- virens Sacc QH in a large-scale cultivation bioreactor. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
15. Two-photon Lau effect.
- Author
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De-Qin Xu, Xin-Bing Song, Hai-Bo Wang, Xiong, Jun, and Kaige Wang
- Published
- 2013
- Full Text
- View/download PDF
16. Ghost imaging via optical parametric amplification.
- Author
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Hong-Guo Li, De-Jian Zhang, De-Qin Xu, Qiu-Li Zhao, Sen Wang, Hai-Bo Wang, Jun Xiong, and Kaige Wang
- Subjects
- *
OPTICAL parametric amplifiers , *LIGHT transmission , *BANDWIDTHS , *IMAGING systems , *OPTICAL resolution - Abstract
We investigate theoretically and experimentally thermal light ghost imaging where the light transmitted through the object as the seed light is amplified by an optical parametric amplifier (OPA). In conventional lens imaging systems with OPA, the spectral bandwidth of OPA dominates the image resolution. Theoretically, we prove that in ghost imaging via optical parametric amplification (GIOPA) the bandwidth of OPA will not affect the image resolution. The experimental results show that for weak seed light the image quality in GIOPA is better than that of conventional ghost imaging. Our work may be valuable in remote sensing with ghost imaging technique, where the light passed through the object is weak after a long-distance propagation. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
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