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Hase, Muneaki; Katsuragawa, Masayuki; Constantinescu, Anca Monia; Petek, Hrvoje |
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Frequency comb generation at terahertz frequencies by coherent phonon excitation in silicon |
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Journal Article |
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2012 |
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Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
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6 |
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243–247 |
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fromIPMRAS |
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High-order nonlinear light–matter interactions in gases enable the generation of X-ray and attosecond light pulses, metrology and spectroscopy1. Optical nonlinearities in solid-state materials are particularly interesting for combining optical and electronic functions for high-bandwidth information processing2. Third-order nonlinear optical processes in silicon have been used to process optical signals with bandwidths greater than 1 GHz (ref. 2). However, fundamental physical processes for a silicon-based optical modulator in the terahertz bandwidth range have not yet been explored. Here, we demonstrate ultrafast phononic modulation of the optical index of silicon by irradiation with intense few-cycle femtosecond pulses. The anisotropic reflectivity modulation by the resonant Raman susceptibility at the fundamental frequency of the longitudinal optical phonon of silicon (15.6 THz) generates a frequency comb up to seventh order. All-optical >100 THz frequency comb generation is realized by harnessing the coherent atomic motion of the silicon crystalline lattice at its highest mechanical frequency. |
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RPLAB @ gujma @ |
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794 |
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Goulielmakis, Eleftherios |
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Title |
Attosecond photonics: Extreme ultraviolet catastrophes |
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Journal Article |
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2012 |
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Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
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6 |
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3 |
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142-143 |
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Extreme ultraviolet attosecond pulses, which emerge from the interaction of atoms with intense laser fields, play a central role in modern ultrafast science and the exploration of electron behaviour. Recent work now shows that catastrophe theory can help optimize the properties of these pulses. |
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RPLAB @ gujma @ |
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791 |
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Gao, Jie; McMillan, James F.; Wong, Chee Wei |
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Title |
Nanophotonics: Remote on-chip coupling |
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Journal Article |
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2012 |
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Nature Photonics |
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Nat. Photon. |
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6 |
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1 |
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7-8 |
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Scientists have demonstrated strongly coupled photon states between two distant high-Q photonic crystal cavities connected by a photonic crystal waveguide. Remote dynamic control over the coupled states could aid the development of delay lines, optical buffers and qubit operations in both classical and quantum information processing. |
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RPLAB @ gujma @ |
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779 |
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Gabay, Marc; Triscone, Jean-Marc |
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Title |
Superconductors: Terahertz superconducting switch |
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Journal Article |
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2011 |
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Nature Photonics |
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Nat. Photon. |
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5 |
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8 |
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447-449 |
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The use of terahertz pulses to 'gate' interlayer charge transport in a superconductor could lead to a variety of new and interesting applications. |
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RPLAB @ gujma @ |
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777 |
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Fazal, Furqan M.; Block, Steven M. |
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Title |
Optical tweezers study life under tension |
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Journal Article |
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2011 |
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Nature Photonics |
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Nat. Photon. |
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5 |
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6 |
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318-321 |
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fromIPMRAS |
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Optical tweezers have become one of the primary weapons in the arsenal of biophysicists, and have revolutionized the new field of single-molecule biophysics. Today's techniques allow high-resolution experiments on biological macromolecules that were mere pipe dreams only a decade ago. |
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no |
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RPLAB @ gujma @ |
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776 |
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Divochiy, Aleksander; Marsili, Francesco; Bitauld, David; Gaggero, Alessandro; Leoni, Roberto; Mattioli, Francesco; Korneev, Alexander; Seleznev, Vitaliy; Kaurova, Nataliya; Minaeva, Olga; Gol'tsman, Gregory; Lagoudakis, Konstantinos G.; Benkhaoul, Moushab; Lévy, Francis; Fiore, Andrea |
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Title |
Superconducting nanowire photon-number-resolving detector at telecommunication wavelengths |
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Journal Article |
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2008 |
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Nat. Photon. |
Abbreviated Journal |
Nat. Photon. |
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2 |
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5 |
Pages |
302-306 |
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SSPD, photon-number-resolving |
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Optical-to-electrical conversion, which is the basis of the operation of optical detectors, can be linear or nonlinear. When high sensitivities are needed, single-photon detectors are used, which operate in a strongly nonlinear mode, their response being independent of the number of detected photons. However, photon-number-resolving detectors are needed, particularly in quantum optics, where n-photon states are routinely produced. In quantum communication and quantum information processing, the photon-number-resolving functionality is key to many protocols, such as the implementation of quantum repeaters1 and linear-optics quantum computing2. A linear detector with single-photon sensitivity can also be used for measuring a temporal waveform at extremely low light levels, such as in long-distance optical communications, fluorescence spectroscopy and optical time-domain reflectometry. We demonstrate here a photon-number-resolving detector based on parallel superconducting nanowires and capable of counting up to four photons at telecommunication wavelengths, with an ultralow dark count rate and high counting frequency. |
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916 |
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Capmany, José; Gasulla, Ivana; Sales, Salvador |
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Title |
Microwave photonics: Harnessing slow light |
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Journal Article |
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2011 |
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Nature Photonics |
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Nat. Photon. |
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5 |
Issue |
12 |
Pages |
731-733 |
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Slow-light techniques originally conceived for buffering high-speed digital optical signals now look set to play an important role in providing broadband phase and true time delays for microwave signals. |
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RPLAB @ gujma @ |
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778 |
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Brida, G.; Genovese, M.; Ruo Berchera, I. |
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Title |
Experimental realization of sub-shot-noise quantum imaging |
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Journal Article |
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2010 |
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Nature Photonics |
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Nat. Photon. |
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4 |
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4 |
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227-230 |
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fromIPMRAS |
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The properties of quantum states have led to the development of new technologies, ranging from quantum information to quantum metrology. A recent field of research to emerge is quantum imaging, which aims to overcome the limits of classical imaging by making use of the spatial properties of quantum states of light . In particular, quantum correlations between twin beams represent a fundamental resource for these studies. One of the most interesting proposed schemes takes advantage of the spatial quantum correlations between parametric down-conversion light beams to realize sub-shot-noise imaging of weak absorbing objects, leading ideally to noise-free imaging. Here, we present the first experimental realization of this scheme, showing its potential to achieve a larger signal-to-noise ratio than classical imaging methods. This work represents the starting point for this quantum technology, which we anticipate will have applications when there is a requirement for low-photon-flux illumination (for example for use with biological samples). |
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RPLAB @ gujma @ |
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771 |
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Akalin, Tahsin |
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Title |
Terahertz sources: Powerful photomixers |
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2012 |
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Nature Photonics |
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Nat. Photon. |
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6 |
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2 |
Pages |
81 |
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An efficient continuous-wave source of terahertz radiation that combines the outputs from two near-infrared semiconductor lasers in a novel photomixer looks set to benefit applications in spectroscopy and imaging. |
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RPLAB @ gujma @ |
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787 |
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