scholarly journals Fourier Analysis of Slow and Fast Image Propagation through Single and Coupled Image Resonators

2012 ◽  
Vol 2012 ◽  
pp. 1-9
Author(s):  
Parvin Sultana ◽  
Takahiro Matsumoto ◽  
Makoto Tomita
Keyword(s):  
Transfer Functions ◽  
Phase Transfer ◽  
Streak Camera ◽  
Fourier Method ◽  
Observation Time ◽  
Two Dimensional ◽  
Fourier Space ◽  
Time Resolved ◽  
Spatial Image ◽  
Comprehensive Study

We applied Fourier space analysis to a comprehensive study of the propagation of pulsed two-dimensional images through single and coupled image resonators. The Fourier method shows that the image can propagate through the resonator successfully as long as the spatial and temporal Fourier components of the image are within the bandwidth of the amplitude and phase transfer functions. The relevant steep dispersion of the cavity can yield delayed or advanced images. The Fourier method reproduces characteristic aspects of the experimental observations of the image propagation, and also predicts new aspects, such as the spatial image profile dependence on the observation time and the coupling strength. To demonstrate the time evolution of the experiment, space- and time-resolved image propagations were performed using a streak camera.

Exciton dynamics and annihilation in WS2 2D semiconductors

Nanoscale ◽  
2015 ◽  
Vol 7 (16) ◽  
pp. 7402-7408 ◽  
Author(s):  
Long Yuan ◽  
Libai Huang
Keyword(s):  
Two Dimensional ◽  
Time Resolved ◽  
Exciton Dynamics ◽  
2D Semiconductors ◽  
Time Resolved Photoluminescence ◽  
2D Crystals

We systematically investigate the exciton dynamics in monolayered, bilayered, and trilayered WS2 two-dimensional (2D) crystals by time-resolved photoluminescence (TRPL) spectroscopy.

Synthesis of Cascaded Three-Terminal RC Networks with Minimum-Phase Transfer Functions

1952 ◽  
Vol 40 (12) ◽  
pp. 1717-1723 ◽  
Author(s):  
P. Ordijng ◽  
F. Hopkins ◽  
H. Krauss ◽  
E. Sparrow
Keyword(s):  
Transfer Functions ◽  
Phase Transfer ◽  
Minimum Phase ◽  
Rc Networks

Time-resolved gain-spectrum measurement scheme using two potential laser media and a streak camera

2001 ◽  
Vol 72 (7) ◽  
pp. 2875-2878
Author(s):  
Toshimasa Kozeki ◽  
Yuji Suzuki ◽  
Zhenlin Liu ◽  
Nobuhiko Sarukura ◽  
Kiyoshi Shimamura ◽  
...  
Keyword(s):  
Streak Camera ◽  
Gain Spectrum ◽  
Time Resolved ◽  
Measurement Scheme ◽  
Spectrum Measurement ◽  
Laser Media

Visual cortex neurons in monkey and cat: Effect of contrast on the spatial and temporal phase transfer functions

1995 ◽  
Vol 12 (6) ◽  
pp. 1191-1210 ◽  
Author(s):  
Duane G. Albrecht
Keyword(s):  
Visual Cortex ◽  
Transfer Function ◽  
Receptive Field ◽  
Transfer Functions ◽  
Phase Transfer ◽  
Sine Wave ◽  
Phase Advance ◽  
Systematic Effect ◽  
Temporal Phase ◽  
Visual Cortex Neurons

AbstractThe responses of simple cells (recorded from within the striate visual cortex) were measured as a function of the contrast and the frequency of sine-wave grating patterns in order to explore the effect of contrast on the spatial and temporal phase transfer functions and on the spatiotemporal receptive field. In general, as the contrast increased, the phase of the response advanced by approximately 45 ms (approximately one-quarter of a cycle for frequencies near 5 Hz), although the exact value varied from cell to cell. The dynamics of this phase-advance were similar to the dynamics of the amplitude: the amplitude and the phase increased in an accelerating fashion at lower contrasts and then saturated at higher contrasts. Further, the gain for both the amplitude and the phase appeared to be governed by the magnitude of the contrast rather than the magnitude of the response. For the spatial phase transfer function, variations in contrast had little or no systematic effect; all of the phase responses clustered around a single straight line, with a common slope and intercept. This implies that the phase-advance was not due to a change in the spatial properties of the neuron; it also implies that the phase-advance was not systematically related to the magnitude of the response amplitude. On the other hand, for the temporal phase transfer function, the phase responses fell on five straight lines, related to the five steps in contrast. As the contrast increased, the phase responses advanced such that both the slope and the intercept were affected. This implies that the phase-advance was a result of contrast-induced changes in both the response latency and the shape/symmetry of the temporal receptive field.

Two-dimensional camera for millisecond range time-resolved small- and wide-angle X-ray scattering

2003 ◽  
Vol 36 (3) ◽  
pp. 809-811 ◽  
Author(s):  
Volker Urban ◽  
Pierre Panine ◽  
Cyril Ponchut ◽  
Peter Boesecke ◽  
Theyencheri Narayanan
Keyword(s):  
Wide Angle ◽  
Two Dimensional ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Millisecond Range ◽  
Ray Scattering
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