Compressive ghost imaging

We describe an advanced image reconstruction algorithm for pseudothermal ghost imaging, reducing the number of measurements required for image recovery by an order of magnitude. The algorithm is based on compressed sensing, a technique that enables the reconstruction of an N-pixel image from much less than N measurements. We demonstrate the algorithm using experimental data from a pseudothermal ghost-imaging setup. The algorithm can be applied to data taken from past pseudothermal ghost-imaging experiments, improving the reconstruction's quality.Comment: Comments are welcom

The Dual Stricture of the Israeli Economy: Is Technology the Solution?

The main concern of this research is the conflict between technology and society. It concentrates on the in the Israeli society, which is split in half: on the one hand it is in the information era, with highly advanced technology sector, while on the other hand it is still considered a developing country in terms of social development among large segments of society. The dual structure of the economy means that despite being known as the “Start-Up Nation”, Israel has one of the highest poverty rates with the gap between the rich and the poor is widening. The research argues that the problem is the dual structure: the nation is leading the world in technological development, but the services provided to its citizens are limited to the extent that poverty is high. The research further claims that the solution is technology: the technological advantage of Israel promoted its economy, which has grown more rapidly than most other advanced economies, after the government made a strategic decision to promote technology by providing financial support for in research and development. The rise in social and sectorial media allows the poorest parts of society—the Ultra-Orthodox and the Israeli-Arabs—to adopt technology and benefit from the leading role of the country in technological development and global competition. This means that while technology created the problem of dual structure—it also allows the segments of society that are considered poor and underdeveloped to use advanced media services within their communities

The Impact of Social Revolutions on the Arab-Israeli Conflict

The Arab Spring refers to the protests and revolutions that spread across Middle Eastern and North African Muslim countries in the spring of 2011. It was the first “social media revolution”, which demonstrated the spread of social revolution and the way civil protests and demands for political reforms can swiftly spread globally through social media. Following the social movement in the Arab World, the turmoil in the Middle East continued with the Israeli Social Justice movement of summer 2011, which was also identified as a social media revolution. Same as in the Arab World, in Israel too new media increased the role of the public, who could influence political issues by bypassing the monopoly of the political establishment and traditional media on the political discourse. The research examines the way that the concept of democracy in the region changed in the digital age. The findings show that social media became crucial in shaping the political discourse and determined dramatic changes in the balance of political power in Israel and Arab countries. Through digital technology and online campaigns politics changed as young Arabs and Israeli altered public agenda from the traditional religious and political Arab-Israeli conflict to social and economic issues

Ghost imaging with a single detector

We experimentally demonstrate pseudothermal ghost imaging and ghost diffraction using only a single single-pixel detector. We achieve this by replacing the high resolution detector of the reference beam with a computation of the propagating field, following a recent proposal by Shapiro [J. H. Shapiro, arXiv:0807.2614 (2008)]. Since only a single detector is used, this provides an experimental evidence that pseudothermal ghost imaging does not rely on non-local quantum correlations. In addition, we show the depth-resolving capability of this ghost imaging technique.Comment: See video at http://www.weizmann.ac.il/home/feori/Misc.html Comments are welcom

Standoff Detection via Single-Beam Spectral Notch Filtered Pulses

We demonstrate single-beam coherent anti-Stokes Raman spectroscopy (CARS), for detecting and identifying traces of solids, including minute amounts of explosives, from a standoff distance (>50 m) using intense femtosecond pulses. Until now, single-beam CARS methods relied on pulse-shapers in order to obtain vibrational spectra. Here we present a simple and easy-to-implement detection scheme, using a commercially available notch filter, that does not require the use of a pulse-shaper.Comment: 3 pages, 3 figure