39 research outputs found
Experimental realization of the active convolved illumination imaging technique for enhanced signal-to-noise ratio
No full textImaging is indispensable for nearly every field of science, engineering,
technology, and medicine. However, measurement noise and stochastic distortions
pose fundamental limits to accessible spatiotemporal information despite
impressive tools such as SIM, PALM/STORM, and STED microscopy. How to combat
this challenge ideally has been an open question for decades. Inspired by a
"virtual gain" technique to compensate losses in metamaterials, "active
convolved illumination" has been recently proposed to significantly improve the
signal-to-noise ratio, hence data acquisition. In this technique, the light
pattern of the object is superimposed with a correlated auxiliary pattern, the
function of which is to reverse the adverse effect of noise and random
distortion based on their spectral characteristics. Despite enormous
implications in statistics, an experimental realization of this novel technique
has been lacking to date. Here, we present the first experimental
demonstration. We find that the active convolved illumination does not only
boost the resolution limit and image contrast, but also the resistance to pixel
saturation. The results confirm the previous theories and opens up new horizons
in a wide range of disciplines from atmospheric sciences, seismology, biology,
statistical learning, and information processing to quantum noise beyond the
fundamental boundaries.Comment: 16 pages, 9 figure
Light amplification in metamaterials by surface plasmon polariton injection
No full text© 2014 IEEE. We propose a new method to amplify light in metamaterial structures. Two auxiliary light sources generated by surface plasmons constructively interfere with and amplify the signal photons which are then coupled to free space
Creation of entanglement and implementation of quantum logic gate operations using a three-dimensional photonic crystal single-mode cavity
No full textWe solve the Jaynes-Cummings Hamiltonian with time-dependent coupling parameters under the dipole and rotating-wave approximations for a three-dimensional photonic crystal (PC) single-mode cavity with a sufficiently high-quality Q factor. We then exploit the results to show how to create a maximally entangled state of two atoms and how to implement several quantum logic gates: a dual-rail Hadamard gate, a dual-rail NOT gate, and a SWAP gate. The atoms in all of these operations are syncronized, which is not the case in previous studies of PCs [J. Mod. Opt. 48, 1495 (2001); Ear. Phys. J. D 10, 285 (2000); Eur. Phys. J. D 18, 247 (2002)]. Our method has the potential for extension to N-atom entanglement, universal quantum logic operations, and the implementation of other useful, cavity QED-based quantum information processing tasks. (c) 2007 Optical Society of America
Integrated conditional teleportation and readout circuit based on a photonic crystal single chip
No full textWe demonstrate the design of an integrated conditional quantum teleportation circuit and a readout circuit using a two-dimensional photonic crystal single chip. Fabrication and testing of the proposed quantum circuit can be accomplished with current or near future semiconductor process technology and experimental techniques. The readout part of our device can also be used on its own or integrated with other compatible optical circuits to achieve atomic state detection. Further improvement of the device in terms of compactness and robustness could be achieved by integrating it with sources and detectors in the optical regime. (c) 2007 Optical Society of America
Estimating the image spectrum signal-to-noise ratio for imaging through scattering media
No full text© 2015 Society of Photo-Optical Instrumentation Engineers. The image spectrum signal-to-noise ratio (SNR) provides a means of estimating the noise effective spatial resolution of an imaging system and a means of estimating the highest spatial frequency which can be reconstructed with a postdetection image reconstruction algorithm. Previous work has addressed the effects of aerosol scattering on the overall point spread function (PSF). Here, we seek to extend these results to also account for the effects of measurement noise and to then estimate the noise effective resolution of the system, which accounts for scattering effects on the PSF and measurement noise in the detector. We use a previously published approach to estimating the effective PSF and radiometric calculations to estimate the mean numbers of direct and scattered photons detected by an imaging system due to reflected radiation in the visible and near-infrared, and emitted radiation in mid-infrared (MIR) band, for a horizontal near-ground imaging scenario. The analysis of the image spectrum SNR presented here shows a reduction in the value of noise effective cutoff spatial frequency for images taken through fog aerosol media, and hence emphasizes the degrading effect of fog aerosol models on the spatial resolution of imaging systems
Experimental realization of the active convolved illumination imaging technique for enhanced signal-to-noise ratio
No full textImaging is indispensable for nearly every field of science, engineering, technology, and medicine. However, measurement noise and stochastic distortions pose fundamental limits to accessible spatiotemporal information despite impressive tools such as SIM, PALM/STORM, and STED microscopy. How to combat this challenge ideally has been an open question for decades. Inspired by a "virtual gain" technique to compensate losses in metamaterials, "active convolved illumination" has been recently proposed to significantly improve the signal-to-noise ratio, hence data acquisition. In this technique, the light pattern of the object is superimposed with a correlated auxiliary pattern, the function of which is to reverse the adverse effect of noise and random distortion based on their spectral characteristics. Despite enormous implications in statistics, an experimental realization of this novel technique has been lacking to date. Here, we present the first experimental demonstration. We find that the active convolved illumination does not only boost the resolution limit and image contrast, but also the resistance to pixel saturation. The results confirm the previous theories and opens up new horizons in a wide range of disciplines from atmospheric sciences, seismology, biology, statistical learning, and information processing to quantum noise beyond the fundamental boundaries
Supplementary document for Nonreciprocal magneto-optic beam splitting - 5606509.pdf
No full textTheoretical derivation
