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Tikhonov, V. V.; Polyakova, O. N.; Gol’tsman, G. N.; Dzardanov, A. L.; Boyarskiy, D. A. |
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Determination of dielectric properties of ore minerals in the microwave band |
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2008 |
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Radiophys. Quant. Electron. |
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Radiophys. Quant. Electron. |
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51 |
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12 |
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966-974 |
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Keywords |
ore complex permittivity, chalcopyrite, magnetite, sphalerite, labradorite |
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Abstract |
We consider a method for determining the complex dielectric permittivity of ore and nonmetal minerals in the microwave band of electromagnetic radiation. The results of measuring the reflectivity and transmittivity of chalcopyrite, magnetite, sphalerite, and labradorite samples in the frequency range 77–300 GHz are presented. A method for calculation of the complex dielectric permittivity of minerals on the basis of the obtained experimental data is proposed. The approximation formulas for calculation of the complex dielectric permittivity of the studied minerals are given. |
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0033-8443 |
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1404 |
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Polyakova, O. N.; Tikhonov, V. V.; Dzardanov, A. L.; Boyarskii, D. A.; Gol’tsman, G. N. |
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Title |
Dielectric characteristics of ore minerals in a 10–40 GHz frequency range |
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Journal Article |
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2008 |
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Tech. Phys. Lett. |
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Tech. Phys. Lett. |
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34 |
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11 |
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967-970 |
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ore minerals, complex permittivity, sphalerite, magnetite, labradorite |
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A new approach to investigation of the complex dielectric permittivity of both nonmetallic and ore minerals in the microwave frequency range is proposed. Using this approach, data on the complex permittivity of sphalerite, magnetite, and labradorite in a 10–40 GHz frequency range have been obtained for the first time. A method is proposed for calculating the complex permittivity from experimentally measured frequency dependences of the reflection and transmission coefficients of a plane-parallel plate of a given mineral. Approximate expressions that can be used for calculations of the complex refractive index and permittivity of minerals are presented. |
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1063-7850 |
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1406 |
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Anant, Vikas; Kerman, Andrew J.; Dauler, Eric A.; Yang, Joel K. W.; Rosfjord, Krist.ine M.; Berggren, Karl K. |
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Optical properties of superconducting nanowire single-photon detectors |
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2008 |
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Optics Express |
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Opt. Express |
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16 |
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14 |
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10750 |
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1094-4087 |
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RPLAB @ s @ |
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413 |
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Mohan, N.; Minaeva, O.; Gol'tsman, G. N.; Nasr, M. B.; Saleh, B. E.; Sergienko, A. V.; Teich, M. C. |
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Photon-counting optical coherence-domain reflectometry using superconducting single-photon detectors |
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2008 |
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Opt. Express |
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Opt. Express |
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16 |
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22 |
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18118-18130 |
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SSPD, SNSPD |
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We consider the use of single-photon counting detectors in coherence-domain imaging. Detectors operated in this mode exhibit reduced noise, which leads to increased sensitivity for weak light sources and weakly reflecting samples. In particular, we experimentally demonstrate the possibility of using superconducting single-photon detectors (SSPDs) for optical coherence-domain reflectometry (OCDR). These detectors are sensitive over the full spectral range that is useful for carrying out such imaging in biological samples. With counting rates as high as 100 MHz, SSPDs also offer a high rate of data acquisition if the light flux is sufficient. |
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Department of Biomedical Engineering, Boston University, Boston, MA 02215, USA. nm82@bu.edu |
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1094-4087 |
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PMID:18958090 |
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1407 |
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Nasr, M. B.; Minaeva, O.; Goltsman, G. N.; Sergienko, A. V.; Saleh, B. E.; Teich, M. C. |
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Submicron axial resolution in an ultrabroadband two-photon interferometer using superconducting single-photon detectors |
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2008 |
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Opt. Express |
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Opt. Express |
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16 |
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19 |
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15104-15108 |
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SSPD, SNSPD |
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We generate ultrabroadband biphotons via the process of spontaneous parametric down-conversion in a quasi-phase-matched nonlinear grating that has a linearly chirped poling period. Using these biphotons in conjunction with superconducting single-photon detectors (SSPDs), we measure the narrowest Hong-Ou-Mandel dip to date in a two-photon interferometer, having a full width at half maximum (FWHM) of approximately 5.7 fsec. This FWHM corresponds to a quantum optical coherence tomography (QOCT) axial resolution of 0.85 µm. Our results indicate that a high flux of nonoverlapping biphotons may be generated, as required in many applications of nonclassical light. |
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Departments of Electrical & Computer Engineering and Physics, Quantum Imaging Laboratory, Boston University, Boston, MA 02215, USA. boshra@bu.edu |
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English |
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1094-4087 |
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PMID:18795048 |
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1408 |
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