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Author |
Hase, Muneaki; Katsuragawa, Masayuki; Constantinescu, Anca Monia; Petek, Hrvoje |
Title |
Frequency comb generation at terahertz frequencies by coherent phonon excitation in silicon |
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Journal Article |
Year |
2012 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
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6 |
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Pages |
243–247 |
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fromIPMRAS |
Abstract |
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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Author |
Goulielmakis, Eleftherios |
Title |
Attosecond photonics: Extreme ultraviolet catastrophes |
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Journal Article |
Year |
2012 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
Volume |
6 |
Issue |
3 |
Pages |
142-143 |
Keywords |
fromIPMRAS |
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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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791 |
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Pris, Andrew D.; Utturkar, Yogen; Surman, Cheryl; Morris, William G.; Vert, Alexey; Zalyubovskiy, Sergiy; Deng, Tao; Ghiradella, Helen T.; Potyrailo, Radislav A. |
Title |
Towards high-speed imaging of infrared photons with bio-inspired nanoarchitectures |
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Journal Article |
Year |
2012 |
Publication |
Nature Photonics |
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Nat. Photon. |
Volume |
6 |
Issue |
3 |
Pages |
195-200 |
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fromIPMRAS |
Abstract |
Existing infrared detectors rely on complex microfabrication and thermal management methods. Here, we report an attractive platform of low-thermal-mass resonators inspired by the architectures of iridescent Morpho butterfly scales. In these resonators, the optical cavity is modulated by its thermal expansion and refractive index change, resulting in `wavelength conversion' of mid-wave infrared (3-8 µm) radiation into visible iridescence changes. By doping Morpho butterfly scales with single-walled carbon nanotubes, we achieved mid-wave infrared detection with 18-62 mK noise-equivalent temperature difference and 35-40 Hz heat-sink-free response speed. The nanoscale pitch and the extremely small thermal mass of individual `pixels' promise significant improvements over existing detectors. Computational analysis explains the origin of this thermal response and guides future conceptually new bio-inspired thermal imaging sensor designs. |
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RPLAB @ gujma @ |
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785 |
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Author |
Kok, Pieter |
Title |
Quantum optics: Entangled photons report for duty |
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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 |
Issue |
8 |
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504-505 |
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fromIPMRAS |
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Entangled photons are a key ingredient in optical quantum technologies, but researchers have so far been unable to produce a single pair of entangled photons. Now, two groups from China and Austria independently report just that, with a technique that avoids the need to infer entanglement from detection signatures. |
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RPLAB @ gujma @ |
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772 |
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Author |
Ulhaq, A.; Weiler, S.; Ulrich, S. M.; Roßbach, R.; Jetter, M.; Michler, P. |
Title |
Cascaded single-photon emission from the Mollow triplet sidebands of a quantum dot |
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Journal Article |
Year |
2012 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
Volume |
6 |
Issue |
4 |
Pages |
238-242 |
Keywords |
fromIPMRAS |
Abstract |
Emission from a resonantly excited quantum emitter is a fascinating research topic within the field of quantum optics and is a useful source for different types of quantum light fields. The resonance spectrum consists of a single spectral line that develops into a triplet above saturation of the quantum emitter. The three closely spaced photon channels from the resonance fluorescence have different photon statistical signatures. We present a detailed photon statistics analysis of the resonance fluorescence emission triplet from a solid-state-based artificial atom, that is, a semiconductor quantum dot. The photon correlation measurements demonstrate both `single' and `cascaded' photon emission from the Mollow triplet sidebands. The bright and narrow sideband emission (5.9 × 106 photons per second into the first lens) can be conveniently frequency-tuned by laser detuning over 15 times its linewidth (Δv ~ 1.0 GHz). These unique properties make the Mollow triplet sideband emission a valuable light source for quantum light spectroscopy and quantum information applications, for example. |
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RPLAB @ gujma @ |
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788 |
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