Pub Date : 2015-03-13DOI: 10.5220/0005336600910095
G. Giubileo, I. Calderari, A. Puiu
The identification of sophistication in beverage and food products has an increasing role in modern society. Different techniques are currently used for qualitative assessment of food stuff and beverages. Among them high resolution spectroscopy shown to be able to identify different types of sweeteners such as fructose, glucose, maltose, sucrose and aspartame. To this purpose, a reliable, fast and easy-to-use screening method for the optical characterization of these substances was developed. In the present work the Infrared Laser Photo-Acoustic Spectroscopy was used to record high resolution infrared absorption spectra of common sugars in the fingerprint region, not previously reported in literature at our knowledge. Spectral data were obtained by a CO2 laser based optical apparatus. These preliminary results are the key toward a further analysis of sweeteners in a complex matrix devoted to detecting adulteration of commercial fruit juices and light drinks by low cost sweeteners.
{"title":"High resolution spectroscopy of sweeteners","authors":"G. Giubileo, I. Calderari, A. Puiu","doi":"10.5220/0005336600910095","DOIUrl":"https://doi.org/10.5220/0005336600910095","url":null,"abstract":"The identification of sophistication in beverage and food products has an increasing role in modern society. Different techniques are currently used for qualitative assessment of food stuff and beverages. Among them high resolution spectroscopy shown to be able to identify different types of sweeteners such as fructose, glucose, maltose, sucrose and aspartame. To this purpose, a reliable, fast and easy-to-use screening method for the optical characterization of these substances was developed. In the present work the Infrared Laser Photo-Acoustic Spectroscopy was used to record high resolution infrared absorption spectra of common sugars in the fingerprint region, not previously reported in literature at our knowledge. Spectral data were obtained by a CO2 laser based optical apparatus. These preliminary results are the key toward a further analysis of sweeteners in a complex matrix devoted to detecting adulteration of commercial fruit juices and light drinks by low cost sweeteners.","PeriodicalId":170064,"journal":{"name":"2015 International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127469199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Couplers are important parts in integrated optical circuit and high efficiency compact couplers are in great demand. We report on high-efficiency silicon-on-sapphire (SOS) grating couplers at wavelength of 2.7μm. A 75% coupling efficiency and 50nm etching depth bandwidth (the tolerance of etching height) from a standard single-mode fiber to an SOS waveguide is obtained. A basic design principle of the grating coupler is presented, and some improved structures to enhance the coupling efficiency are proposed and estimated. The FDTD method is utilized to simulate and design the grating operated under TE polarization. With our optimization design, the coupling efficiency can be largely increased and beyond 80%. The gratings open the path to silicon photonic chips for the mid-infrared enabling new nonlinear optical functions as well as new spectroscopic lab on-a chip approaches.
{"title":"High performance silicon-on-sapphire subwavelength grating coupler for 2.7µm wavelength","authors":"Jingjing Zhang, Junbo Yang, Wenjun Wu, Hong-hui Jia, Shengli Chang","doi":"10.5220/0005333700730077","DOIUrl":"https://doi.org/10.5220/0005333700730077","url":null,"abstract":"Couplers are important parts in integrated optical circuit and high efficiency compact couplers are in great demand. We report on high-efficiency silicon-on-sapphire (SOS) grating couplers at wavelength of 2.7μm. A 75% coupling efficiency and 50nm etching depth bandwidth (the tolerance of etching height) from a standard single-mode fiber to an SOS waveguide is obtained. A basic design principle of the grating coupler is presented, and some improved structures to enhance the coupling efficiency are proposed and estimated. The FDTD method is utilized to simulate and design the grating operated under TE polarization. With our optimization design, the coupling efficiency can be largely increased and beyond 80%. The gratings open the path to silicon photonic chips for the mid-infrared enabling new nonlinear optical functions as well as new spectroscopic lab on-a chip approaches.","PeriodicalId":170064,"journal":{"name":"2015 International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130146480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-13DOI: 10.5220/0005339701080112
P. Shirshnev, N. Nikonorov, A. Babkina, A. Kim, D. Sobolev, I. Kislyakov, S. Povarov, I. Belousova, E. Kolobkova
The paper describes the technology of obtaining potassium-alumina-borate glass with nanocrystalls of copper chloride. Glass has transmission more than 75 % in visible range and nonlinear threshold less than 10-5 Joules (at the wavelength of 532 nm). Such low threshold can be explained by special structure of copper-containing nanophase in potassium-alumina-borate glass. In PAB glass low-melting temperatures of nanophase induce nonlinear effects in optics. In phosphate glass copper ions and clusters are responsible for optical nonlinearity.
{"title":"Copper-containing potassium-alumina-borate glass structure and nonlinear optical properties correlation","authors":"P. Shirshnev, N. Nikonorov, A. Babkina, A. Kim, D. Sobolev, I. Kislyakov, S. Povarov, I. Belousova, E. Kolobkova","doi":"10.5220/0005339701080112","DOIUrl":"https://doi.org/10.5220/0005339701080112","url":null,"abstract":"The paper describes the technology of obtaining potassium-alumina-borate glass with nanocrystalls of copper chloride. Glass has transmission more than 75 % in visible range and nonlinear threshold less than 10-5 Joules (at the wavelength of 532 nm). Such low threshold can be explained by special structure of copper-containing nanophase in potassium-alumina-borate glass. In PAB glass low-melting temperatures of nanophase induce nonlinear effects in optics. In phosphate glass copper ions and clusters are responsible for optical nonlinearity.","PeriodicalId":170064,"journal":{"name":"2015 International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131813272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-13DOI: 10.5220/0005332300140021
A. Torabi, A. A. Shishegar
A novel method for computation of modal reflectivity at optical waveguide end-facet is presented. The method is based on the characteristic Green's function (CGF) technique. Using separability assumption of the structure and rational function fitting method (RFFM), a closed-form field expression is derived for optical planar waveguide. The uniform derived expression consists of discrete and continuous spectrum contributions which denotes guided and radiation modes effects respectively. An optimization problem is then defined to calculate the exact reflection coefficients at the end-facet for all extracted poles obtained from rational function fitting step. The proposed CGF-RFFM-optimization offers superior exactness in comparison with the previous reported CGF-complex images (CI) technique due to contribution of all components of field in the optimization problem. The main advantage of the proposed method lies in its simple implementation as well as precision for any refractive index contrast. Excellent numerical agreements with rigorous methods are shown in several examples.
{"title":"Combination of characteristic Green's function technique and rational function fitting method for computation of modal reflectivity at the optical waveguide end-facet","authors":"A. Torabi, A. A. Shishegar","doi":"10.5220/0005332300140021","DOIUrl":"https://doi.org/10.5220/0005332300140021","url":null,"abstract":"A novel method for computation of modal reflectivity at optical waveguide end-facet is presented. The method is based on the characteristic Green's function (CGF) technique. Using separability assumption of the structure and rational function fitting method (RFFM), a closed-form field expression is derived for optical planar waveguide. The uniform derived expression consists of discrete and continuous spectrum contributions which denotes guided and radiation modes effects respectively. An optimization problem is then defined to calculate the exact reflection coefficients at the end-facet for all extracted poles obtained from rational function fitting step. The proposed CGF-RFFM-optimization offers superior exactness in comparison with the previous reported CGF-complex images (CI) technique due to contribution of all components of field in the optimization problem. The main advantage of the proposed method lies in its simple implementation as well as precision for any refractive index contrast. Excellent numerical agreements with rigorous methods are shown in several examples.","PeriodicalId":170064,"journal":{"name":"2015 International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131898832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-13DOI: 10.5220/0005336400850090
Wei‐Jun Chen
In this paper a paraxial imaging system with incoherent illumination is interpreted as a signal processing system in which a thin lens performs a forward angular transform on light rays traveling through it. Inverse angular transform exists and could be performed by another thin lens which coincides its focus plane with the first. The common focus plane acts as an angular domain, on which filtering is possible by placing aperture stops. A symmetrically angular filtering results in a direct correspondence between a recorded signal and its object distance. Such a “transform-filtering-inverse transform” system could be understood as a modified tele-centric system, with which a novel concept for measuring a distance without focusing on the target is suggested.
{"title":"Measuring distance by angular domain filtering","authors":"Wei‐Jun Chen","doi":"10.5220/0005336400850090","DOIUrl":"https://doi.org/10.5220/0005336400850090","url":null,"abstract":"In this paper a paraxial imaging system with incoherent illumination is interpreted as a signal processing system in which a thin lens performs a forward angular transform on light rays traveling through it. Inverse angular transform exists and could be performed by another thin lens which coincides its focus plane with the first. The common focus plane acts as an angular domain, on which filtering is possible by placing aperture stops. A symmetrically angular filtering results in a direct correspondence between a recorded signal and its object distance. Such a “transform-filtering-inverse transform” system could be understood as a modified tele-centric system, with which a novel concept for measuring a distance without focusing on the target is suggested.","PeriodicalId":170064,"journal":{"name":"2015 International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134127082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-13DOI: 10.5220/0005335800400046
S. Krishnamoorthy, H. Ravishankar, Pradeep Kumar, A. Prabhakar
The photon number statistics of a coherent optical pulse will typically follow a Poissonian distribution. At low photon numbers, a gated avalanche photo-detector (GAPD) is used to detect the presence of photons in each optical pulse. GAPDs use a thresholding logic, but suffer from after-pulsing effects. The efficiency of a GAPD was characterized and its after-pulses were analyzed by looking at the detection patterns obtained. The GAPD was found to show evidence of stochastic resonance which affected the dark noise of the detector. We post-process the detected bit patterns to eliminate the resonances and estimate the true dark count of the detector. The GAPD was then used with a recirculating optical loop to build a multi-photon resolving detector (MPRD). In the MPRD, the probability of detection at consecutive loop round trip times were used to estimate the mean photon number. We quantify these statistics and establish a reliable measure of photon number at an optical power of −94 dBm. The digital electronics was able to store data for 224 optical pulses, making the statistical analysis meaningful.
{"title":"Stochastic resonances in photon number resolving detectors","authors":"S. Krishnamoorthy, H. Ravishankar, Pradeep Kumar, A. Prabhakar","doi":"10.5220/0005335800400046","DOIUrl":"https://doi.org/10.5220/0005335800400046","url":null,"abstract":"The photon number statistics of a coherent optical pulse will typically follow a Poissonian distribution. At low photon numbers, a gated avalanche photo-detector (GAPD) is used to detect the presence of photons in each optical pulse. GAPDs use a thresholding logic, but suffer from after-pulsing effects. The efficiency of a GAPD was characterized and its after-pulses were analyzed by looking at the detection patterns obtained. The GAPD was found to show evidence of stochastic resonance which affected the dark noise of the detector. We post-process the detected bit patterns to eliminate the resonances and estimate the true dark count of the detector. The GAPD was then used with a recirculating optical loop to build a multi-photon resolving detector (MPRD). In the MPRD, the probability of detection at consecutive loop round trip times were used to estimate the mean photon number. We quantify these statistics and establish a reliable measure of photon number at an optical power of −94 dBm. The digital electronics was able to store data for 224 optical pulses, making the statistical analysis meaningful.","PeriodicalId":170064,"journal":{"name":"2015 International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134356452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-13DOI: 10.5220/0005291600530060
P. Berczyński, S. Marczyński
The complex geometrical optics (CGO) was applied for the spatiotemporal evolution of arbitrary number of 3D mutually incoherent (with different carrier frequencies) Gaussian wave packets (GWPs) interacting and propagating in a nonlinear medium of Kerr type. The CGO reduced description of the propagation of the beam, the pulse and the wave packet to complex ordinary differential equations (ODE) This leads to exceptionally fast numerical algorithms. We observed high efficiency of the CGO method to compute interactions of arbitrary number of 3D Gaussian wave packets propagating in a nonlinear (anomalous) dispersive medium of the Kerr type. The derived CGO equations were compared with equations obtained by the variational method. CGO described the Gaussian beam propagation in free space as well as the Gaussian pulse spreading in the linear anomalous dispersive medium more illustratively than both the Fourier transform method and the Fresnel diffraction integral method. The spatiotemporal CGO has been proven to be a method more practical than the spectral analysis, the variational method, the method of moments and the method of the generalized eikonal approximation. Complementary to the presented results, an on-line CGO solver, implemented in Javascript, is freely available at the authors' website: http://slawek.ps.pl/odelia.html.
{"title":"Spatiotemporal Complex Geometrical Optics (CGO) of N 3D interacting asymmetric Gaussian wave packets in nonlinear medium: CGO as the simplest and efficient method for spatiotemporal evolution","authors":"P. Berczyński, S. Marczyński","doi":"10.5220/0005291600530060","DOIUrl":"https://doi.org/10.5220/0005291600530060","url":null,"abstract":"The complex geometrical optics (CGO) was applied for the spatiotemporal evolution of arbitrary number of 3D mutually incoherent (with different carrier frequencies) Gaussian wave packets (GWPs) interacting and propagating in a nonlinear medium of Kerr type. The CGO reduced description of the propagation of the beam, the pulse and the wave packet to complex ordinary differential equations (ODE) This leads to exceptionally fast numerical algorithms. We observed high efficiency of the CGO method to compute interactions of arbitrary number of 3D Gaussian wave packets propagating in a nonlinear (anomalous) dispersive medium of the Kerr type. The derived CGO equations were compared with equations obtained by the variational method. CGO described the Gaussian beam propagation in free space as well as the Gaussian pulse spreading in the linear anomalous dispersive medium more illustratively than both the Fourier transform method and the Fresnel diffraction integral method. The spatiotemporal CGO has been proven to be a method more practical than the spectral analysis, the variational method, the method of moments and the method of the generalized eikonal approximation. Complementary to the presented results, an on-line CGO solver, implemented in Javascript, is freely available at the authors' website: http://slawek.ps.pl/odelia.html.","PeriodicalId":170064,"journal":{"name":"2015 International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129348822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-13DOI: 10.5220/0005257800550059
Jahirul Islam, J. Atai
The existence and stability of Bragg grating solitons in a coupler, where one core is equipped with a Bragg grating (BG) and has cubic-quintic nonlinearity and the other is linear, are studied. When the group velocity term in the linear core is zero (i.e. c = 0), the system's linear spectrum contains two separate bandgaps. It is found that soliton solutions exist throughout both bandgaps. On the other hand, when the group velocity term in the linear core is nonzero (c ≠ 0), the spectrum consists of three gaps: a genuine central gap and upper and lower gaps that overlap with one branch of continuous spectrum. In this case, soliton solutions exist throughout the upper and lower gaps but not in the central gap. The system supports two disjoint families of solitons (referred to as Type 1 and Type 2) that are separated by a boundary. Stability of solitons is investigated by means of systematic numerical stability analysis. It is found that Type 2 solitons are always unstable. On the other hand, there exist vast regions in the upper and lower bandgaps where stable Type 1 solitons exist.
{"title":"Bragg grating solitons in semilinear dual-core system with cubic-quintic nonlinearity","authors":"Jahirul Islam, J. Atai","doi":"10.5220/0005257800550059","DOIUrl":"https://doi.org/10.5220/0005257800550059","url":null,"abstract":"The existence and stability of Bragg grating solitons in a coupler, where one core is equipped with a Bragg grating (BG) and has cubic-quintic nonlinearity and the other is linear, are studied. When the group velocity term in the linear core is zero (i.e. c = 0), the system's linear spectrum contains two separate bandgaps. It is found that soliton solutions exist throughout both bandgaps. On the other hand, when the group velocity term in the linear core is nonzero (c ≠ 0), the spectrum consists of three gaps: a genuine central gap and upper and lower gaps that overlap with one branch of continuous spectrum. In this case, soliton solutions exist throughout the upper and lower gaps but not in the central gap. The system supports two disjoint families of solitons (referred to as Type 1 and Type 2) that are separated by a boundary. Stability of solitons is investigated by means of systematic numerical stability analysis. It is found that Type 2 solitons are always unstable. On the other hand, there exist vast regions in the upper and lower bandgaps where stable Type 1 solitons exist.","PeriodicalId":170064,"journal":{"name":"2015 International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121829338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-13DOI: 10.5220/0005319800610066
M. Ghasemi, P. Choudhury
The transverse electric (TE) behaviour of light in a doubly-clad cylindrical optical fiber loaded with radially anisotropic liquid crystal material at the outermost cladding is investigated. Moreover, this situation is studied when a conducting tape helix structure is introduced at the boundary of the isotropic dielectric core and the inner dielectric clad of the fiber. The outer clad is considered to be made of anisotropic nematic liquid crystal (NLC). Using Maxwell's electromagnetic field equations, confinement plots are obtained for the transmitted power in each scenario, under the situation of varying core dimension, and compared. Results confirm the achievement of better confinement in the liquid crystal layer of the conducting tape helix loaded fiber, which can even be tailored by using different angle of helix pitch.
{"title":"TE modes in liquid crystal optical fibers embedded with conducting tape helix structure","authors":"M. Ghasemi, P. Choudhury","doi":"10.5220/0005319800610066","DOIUrl":"https://doi.org/10.5220/0005319800610066","url":null,"abstract":"The transverse electric (TE) behaviour of light in a doubly-clad cylindrical optical fiber loaded with radially anisotropic liquid crystal material at the outermost cladding is investigated. Moreover, this situation is studied when a conducting tape helix structure is introduced at the boundary of the isotropic dielectric core and the inner dielectric clad of the fiber. The outer clad is considered to be made of anisotropic nematic liquid crystal (NLC). Using Maxwell's electromagnetic field equations, confinement plots are obtained for the transmitted power in each scenario, under the situation of varying core dimension, and compared. Results confirm the achievement of better confinement in the liquid crystal layer of the conducting tape helix loaded fiber, which can even be tailored by using different angle of helix pitch.","PeriodicalId":170064,"journal":{"name":"2015 International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127867432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-13DOI: 10.5220/0005334100870089
O. Rabinovich, S. Didenko, S. Legotin, M. Basalevskiy
AlGaAs/GaAs photodetectors operate at room temperature in the visible spectrum. Distinctive features of the photodetectors are: high absolute spectral sensitivity up to 0.112 A / W at μmax = 530–570 nm; photodiodes showed the low dark current of 4.7 nA and 530 nA, accordantly, at 5 V reverse bias. The shift of the spectral characteristics which is associated with an increase in the band gap was detected.
AlGaAs/GaAs光电探测器工作在室温下的可见光谱。该光电探测器的特点是:在μmax = 530-570 nm处，绝对光谱灵敏度高达0.112 A / W;在5 V反向偏置下，光电二极管显示出4.7 nA和530 nA的低暗电流。光谱特性的位移与带隙的增加有关。
{"title":"Creating AlGaAs photodetectors","authors":"O. Rabinovich, S. Didenko, S. Legotin, M. Basalevskiy","doi":"10.5220/0005334100870089","DOIUrl":"https://doi.org/10.5220/0005334100870089","url":null,"abstract":"AlGaAs/GaAs photodetectors operate at room temperature in the visible spectrum. Distinctive features of the photodetectors are: high absolute spectral sensitivity up to 0.112 A / W at μmax = 530–570 nm; photodiodes showed the low dark current of 4.7 nA and 530 nA, accordantly, at 5 V reverse bias. The shift of the spectral characteristics which is associated with an increase in the band gap was detected.","PeriodicalId":170064,"journal":{"name":"2015 International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128780089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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