Relevant bibliographies by topics / Evanescent wave Johnson noise

Academic literature on the topic 'Evanescent wave Johnson noise'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Evanescent wave Johnson noise"

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Premakumar, Vickram N., Maxim G. Vavilov, and Robert Joynt. "Evanescent-wave Johnson noise in small devices." Quantum Science and Technology 3, no. 1 (October 25, 2017): 015001. http://dx.doi.org/10.1088/2058-9565/aa8e15.

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Cui, Fan, and David J. Pine. "Effect of photon counting shot noise on total internal reflection microscopy." Soft Matter 18, no. 1 (2022): 162–71. http://dx.doi.org/10.1039/d1sm01587g.

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Total internal reflection microscopy (TIRM) measures changes in the distance between a colloidal particle and a transparent substrate by measuring the scattering intensity of the particle illuminated by an evanescent wave.
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Stell, J. D., and R. J. Bernhard. "Active Control of High Order Acoustical Modes in a Semi-Infinite Waveguide." Journal of Vibration and Acoustics 113, no. 4 (October 1, 1991): 523–31. http://dx.doi.org/10.1115/1.2930217.

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This paper presents an analysis of the effectiveness of active noise control methods for control of high order modes in rigid-walled, semi-infinite waveguides. The waveguides examined in this investigation are terminated at one end with a rigid end. The case studies performed reconfirmed that n control actuators can control n propagating modes (including the plane wave) in a waveguide if the actuators are properly placed. The results also confirmed that the control actuators should be located at the node surfaces of the most significant evanescent modes to avoid various problems that evanescent modes cause active control systems. A significant new finding is the effect of the rigid waveguide termination on the active controller. The reflected energy from the termination causes standing waves in the region between the rigid termination and the secondary sources. At certain frequencies which correspond to resonant conditions, the standing wave amplitudes become large and the control actuator strength must be high. At these frequencies the effects of the evanescent modes become significant even when the mode is not close to its cut-on frequency. Similar resonant effects can be expected to affect active noise control performance for any case where there are significant reflections in the waveguide upstream of the control actuators.
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Chen, Jingdong, Jin Xiang, Shuai Jiang, Qiaofeng Dai, Shaolong Tie, and Sheng Lan. "Multipole Radiations from Large Gold Nanospheres Excited by Evanescent Wave." Nanomaterials 9, no. 2 (January 31, 2019): 175. http://dx.doi.org/10.3390/nano9020175.

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We proposed the use of the evanescent wave generated in a total internal reflection configuration to excite large gold nanospheres and investigated the radiations of the high-order plasmon modes supported in gold nanospheres. It was revealed that the evanescent wave excitation is equivalent to the excitation by using both the incident and reflected light, offering us the opportunity to control the orientation of the electric field used to excite nanoparticles. In addition, it was found that the scattering light intensity is greatly enhanced and the background noise is considerably suppressed, making it possible to detect the radiations from high-order plasmon modes. Moreover, the influence of the mirror images on the scattering induced by a metal substrate is eliminated as compared with the surface plasmon polariton excitation. By exciting a gold nanosphere with s-polarized light and detecting the scattering light with a p-polarized analyzer, we were able to reveal the radiation from the electric quadrupole mode of the gold nanosphere in both the spatial and the frequency domains. Our findings are important for characterizing the radiations from the high-order modes of large nanoparticles and useful for designing nanoscale photonic devices.
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Danneau, R., F. Wu, M. F. Craciun, S. Russo, M. Y. Tomi, J. Salmilehto, A. F. Morpurgo, and P. J. Hakonen. "Evanescent Wave Transport and Shot Noise in Graphene: Ballistic Regime and Effect of Disorder." Journal of Low Temperature Physics 153, no. 5-6 (October 8, 2008): 374–92. http://dx.doi.org/10.1007/s10909-008-9837-z.

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Chen, Wen-Yu, G. J. Milburn, and S. Dyrting. "Effect of noise and modulation on the reflection of atoms from an evanescent wave." Physical Review A 54, no. 2 (August 1, 1996): 1510–15. http://dx.doi.org/10.1103/physreva.54.1510.

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Brandão, Eric, and Efren Fernandez-Grande. "Analysis of the sound field above finite absorbers in the wave-number domain." Journal of the Acoustical Society of America 151, no. 5 (May 2022): 3019–30. http://dx.doi.org/10.1121/10.0010355.

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This study examines the edge diffraction effect when a sound wave impinges and reflects off finite porous absorbers, flush-mounted in an infinite hard baffle. A theoretical analysis of the diffraction is given by taking a two-dimensional spatial Fourier transform of a plane wave impinging on a finite absorber. Numerical experiments are also presented to simulate the sound field above infinite and finite locally reactive absorbers and the measurement with an array of pressure sensors. In such cases, a regularized solution is used to separate the incident and reflected plane wave components, in the wave-number domain, including both propagating and evanescent waves. The properties of the wave-number spectrum are associated either with the specular reflection or with the diffracted components, caused by the interaction of the sound wave with the finite absorber. From the regularized solution, it is possible to reconstruct the surface impedance and the absorption coefficient of the sample. The influence of Gaussian noise on such measurements is also investigated. The use of propagating and evanescent waves on the sound field model led to an estimation of the absorption coefficient that depends just slightly on the size of the sample, which is a desired feature for in situ measurement methods.
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Oyabu, Yota, Yoshikazu Ohara, Toshihiro Tsuji, and Tsuyoshi Mihara. "Dark-field ultrasonic imaging method using mode-converted longitudinal evanescent field." Japanese Journal of Applied Physics 61, SG (May 19, 2022): SG1042. http://dx.doi.org/10.35848/1347-4065/ac4add.

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Abstract We propose a dark-field evanescent imaging method to visualize surface/subsurface micro defects with a high signal-to-noise ratio (SNR). This method utilizes the mode-converted longitudinal evanescent field (MCLEF) generated at defects by the incidence of a shear (S) wave. When an incident S wave only has the in-plane displacement on the top surface of a specimen, the 2D scan of a laser Doppler vibrometer, that can only measure out-of-plane displacements, can selectively probe the MCLEF with out-of-plane displacements. Note that the MCLEF can be generated even at a defect that is much smaller than the diffraction limit. In this paper, after describing the principle of the proposed method, we prove the concept in a specimen with a hole by finite element (FE) simulation and experiments. Further FE simulations demonstrate its super-resolution imaging capability for holes of different sizes and higher SNR than a conventional method for various defect geometries.
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Ma, Duoxuan, Jie Zhao, Dayong Wang, Hao Lin, Lu Rong, Yunxin Wang, and Shufeng Lin. "Full-Field Super-Resolution Terahertz Imaging Based on Rotating Coherent Scattering Microscopy." Applied Sciences 13, no. 2 (January 11, 2023): 982. http://dx.doi.org/10.3390/app13020982.

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For decades, terahertz (THz) microscopic imaging has been limited by the resolution of the system due to the larger wavelength, the power of the source, and the equivalent noise power of the detector, so a lot of research has focused on single-point scanning imaging. With the development of hardware, full-field THz imaging based on high-power continuous-wave THz sources have been developed such as the direct intensity imaging method and lensless coherent imaging. In particular, the THz direct intensity imaging method requires no complicated computational reconstruction, while the high resolution, as a key issue, still needs to be improved. In this paper, the rotating coherent scattering microscopy was applied to THz imaging for the first time. Here, we designed and fabricated a hemisphere lens with high-resistance silicon. The tilted hemisphere lens transformed the incident divergent beam into a plane wave, and the total internal reflection occurred in the planar surface within the hemispherical lens, and generated evanescent waves in the rare medium. At the same time, the sample was placed very close to the plane of the hemispherical lens, so that the sample was illuminated by the evanescent waves. The scattered waves carried high frequency information to the far field, and thus through an objective, the super-resolution imaging was achieved along a single direction. Then, the hemispherical lens was rotated to obtain coherent scattering microscopic images under different evanescent wave illumination angles. Finally, the full-field super-resolution imaging results were obtained through incoherent superposition.
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Li, Chao, and Jinhai Zhang. "Wavefield separation using irreversible-migration filtering." GEOPHYSICS 87, no. 3 (March 11, 2022): A43—A48. http://dx.doi.org/10.1190/geo2021-0607.1.

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Wavefield separation is important for eliminating unwanted components of seismic data while retaining preferred components therein; however, there have been difficulties with using traditional methods to select a proper muting window in the transformed domain. A narrow muting window can separate different components well, but it causes visible artifacts due to sudden truncations (e.g., the Gibbs phenomenon), whereas a wide muting window would, on the other hand, leave unwanted components. We have adopted separating the wavefield based on its irreversibility after migration and demigration. One-way wave-equation migration would automatically damp high-slope components in the evanescent region while accurately handling the other components. Thus, the migration velocity can be tuned to naturally trap a given range of high-slope components into the evanescent region in the migrated domain, which would be irreversible after demigration. In contrast, the other components (i.e., those outside the evanescent region) can be recovered after demigration. Our method achieves perfect muting by taking advantage of migration and demigration, and thus it avoids the manual operation of setting a muting window. As a result, our method is free of muting artifacts. We conduct numerical experiments with synthetic and field data, and the results verify the excellent performance of our method for several different kinds of wavefield separation, including linear event separation, structural noise elimination, diffraction-reflection separation, and vertical seismic profile wavefield separation. Our method integrates noise reduction and the wavefield separation, and thus it can reduce the computational cost of using different data processing schemes and avoid the related potential error accumulation.
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Dissertations / Theses on the topic "Evanescent wave Johnson noise"

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Prade, Bernard. "Quelques aspects theoriques et experimentaux de la propagation des ondes electromagnetiques dans l'atmosphere et dans une fibre optique monomode." Paris 6, 1987. http://www.theses.fr/1987PA066061.

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Cette these, menee dans le cadre d'un travail sur la transmission d'informations par voie optique, comporte deux parties; la premiere traite du bruit de polarisation introduit par l'atmosphere au repos ou en ecoulement; la seconde partie traite du couplage par champ evanescent dans les fibres monomodes
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Conference papers on the topic "Evanescent wave Johnson noise"

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Jin, Songwan, Peter Huang, Jinil Park, Jung Yul Yoo, and Kenneth S. Breuer. "Near-Surface Velocimetry Using Evanescent Wave Illumination." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55015.

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Total internal reflection fluorescent microscopy (TIRFM) is used to measure particle motion in the near wall region of a microfluidic system. TIRFM images have minimum background noise and contain only particles that are very close to channel surface, where slip velocities may be present. Submicron sized fluorescent particles suspended in water are used as seed particles and images are analyzed with a PTV algorithm to extract information about apparent slip velocity. At relatively low shear rates (less than 2500 sec−1), an apparent slip velocity, proportional to the shear rate was observed. However, numerical simulations show that this observation is a direct consequence of the small, but finite thickness of the illuminated region, and most likely not due to physical slip at the surface. The statistical difference in apparent slip velocities measured over hydrophilic and hydrophobic surfaces is found to be minimal. Issues associated with the experimental technique and the interpretation of the experimental results are also discussed.
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Sukuta, Sydney, and Reinhard F. Bruch. "Noise-band factor analysis of cancer Fourier transform infrared evanescent-wave fiber optical (FTIR-FEW) spectra." In International Symposium on Biomedical Optics, edited by Robert R. Alfano. SPIE, 2002. http://dx.doi.org/10.1117/12.465246.

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Collet, Manuel, Morvan Ouisse, Mohammed Ichchou, and Roger Ohayon. "Semi-Active Optimization of 2D Wave’s Dispersion Into Shunted Piezocomposite Systems for Controlling Acoustic Interaction." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-5018.

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In this paper, we present an application of the Floquet-Bloch theorem in the context of electrodynamics for vibroacoustic power flow optimization by mean of distributed and shunted piezoelectric patches. The main purpose of this work is first to propose a dedicated numerical approach able to compute the multi-modal wave dispersions curves into the whole first Brillouin zone for periodically distributed 2D shunted piezomechanical systems. By using two specific indicators evaluating the evanescent part of Bloch’s waves and the induced electronic damping, we optimize the piezoelectric shunting electrical impedance for controlling energy diffusion into the proposed semi-active distributed set of cells. Sound radiation efficiency is also analyzed for showing the effects of such smart metamaterial for controlling acoustical noise.
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Khader, Rana G., and Reza Sadr. "Effect of Non Uniform Out-of-Plane Illumination and Shear Rate on the Accuracy of nPIV Velocity Measurements." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30567.

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Nano-particle image velocimetry (nPIV) uses evanescent-wave illumination to measure two velocity components, U and V, tangent to the wall in a region with thickness of order of hundred nano meters. In this region the illumination intensity decays exponentially with distance normal to the wall, z, and hence tracers closer to the wall have “brighter” and “bigger” images than those that are further away, i.e. at larger z. Moreover fluid velocity varies in this region with z and hence tracers at different distance from the wall move at different speeds. Furthermore, Brownian displacement of particle tracers in this region is comparable to the displacement due to the fluid convection. The variation in the displacement of particle images in this region, with different brightness and velocities, can bias the near-wall velocities obtained using standard correlation based PIV method. Artificial nPIV images of nano particle in a flow field with linear out of plane velocity profile were used in this work to investigate the impact of these issues upon the accuracy of nPIV data. Uniform and Gaussian random distribution noise were added to the images to simulate electronic noise and shot noise, respectively. The artificial images were obtained and processed for various experimental parameters to incorporate different illumination profile and shear rates. The results demonstrate that non-uniform illumination affects the bias in the estimated tracer velocity for the shear flow. Non-uniform intensity also affects the bias due to Brownian diffusion; however, correction for Brownian diffusion can reduce this bias error.
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