The statistical properties of medical images are central in characterizing the performance of imaging systems. The noise in cone-beam CT (CBCT) is often characterized using Fourier-based metrics, such as the 3D noise-power spectrum (NPS). Under a stationarity assumption, the NPS provides a complete representation of the covariance of the images, since the covariance matrix of the Fourier transf...

Plasmonic nanoantennas, which can efficiently convert light from free space into sub-wavelength scale with the local field enhancement, are fundamental building blocks for nanophotonic systems. Predominant design methods, which exploit a single type of near- or far-field coupling in pairs or arrays of plasmonic nanostructures, have limited the tunability of spectral response and the local field...

This work presents a design and experimental validation of compact ultrawideband (UWB) bowtie antenna balanced-to-unbalanced (balun) circuit for medical microwave imaging (MWI) applications working in the frequency band 1–6 GHz. The UWB balun is perpendicularly attached to planar arms, whose dimensions were miniaturized by rounding edges. reflection coefficient was lower than −12 dB tissues wit...

Owing to the size mismatch between light and nanoscale objects such as single molecules, it is important to be able to control light–molecule interactions1–4. Plasmonic nanoantennas create highly enhanced local fields when pumped resonantly, leading to increased Raman scattering5, but whether fluorescence enhancement occurs depends upon a variety of factors. Although sharp metal tips6 and collo...

We propose and theoretically demonstrate a novel type of optical Yagi-Uda nanoantennas tunable via variation of the free-carrier density of a semiconductor disk placed in a gap of a metallic dipole feeding element. Unlike its narrowband all-metal counterparts, this nanoantenna exhibits a broadband unidirectional emission and demonstrates a bistable response in a preferential direction of the fa...

The algorithm is discussed in the context of one of the practical applications: aligning DNA reads to a reference genome. An implementation of the algorithm is shown to align about 106 reads per CPU minute and about 108 base-pairs per CPU minute (human DNA reads). This implementation is compared to the popular software packages Bowtie and BWA, and is shown to be over 5−10 times faster in some a...