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Author |
Hu, Xiaolong; Dauler, Eric A.; Molnar, Richard J.; Berggren, Karl K. |
Title |
Superconducting nanowire single-photon detectors integrated with optical nano-antennae |
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Journal Article |
Year |
2011 |
Publication |
Optics Express |
Abbreviated Journal |
Opt. Express |
Volume |
19 |
Issue |
1 |
Pages |
17-31 |
Keywords |
optical antennas |
Abstract |
Optical nano-antennae have been integrated with semiconductor lasers to intensify light at the nanoscale and photodiodes to enhance photocurrent. In quantum optics, plasmonic metal structures have been used to enhance nonclassical light emission from single quantum dots. Absorption and detection of single photons from free space could also be enhanced by nanometallic antennae, but this has not previously been demonstrated. Here, we use nano-optical transmission effects in a one-dimensional gold structure, combined with optical cavity resonance, to form optical nano-antennae, which are further used to couple single photons from free space into a 80-nm-wide superconducting nanowire. This antenna-assisted coupling enables a superconducting nanowire single-photon detector with 47% device efficiency at the wavelength of 1550 nm and 9-μm-by-9-μm active area while maintaining a reset time of only 5 ns. We demonstrate nanoscale antenna-like structures to achieve exceptional efficiency and speed in single-photon detection. |
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RPLAB @ gujma @ |
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745 |
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Author |
Курочкин, Юрий Владимирович |
Title |
Методы повышения пропускной способности квантовой криптографии |
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Manuscript |
Year |
2011 |
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МФТИ |
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quantum cryptography |
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Ph.D. thesis |
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762 |
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Author |
Peruzzo, Alberto; Laing, Anthony; Politi, Alberto; Rudolph, Terry; O'Brien, Jeremy L. |
Title |
Multimode quantum interference of photons in multiport integrated devices |
Type |
Journal Article |
Year |
2011 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat. Comm. |
Volume |
2 |
Issue |
224 |
Pages |
6 |
Keywords |
fromIPMRAS |
Abstract |
Photonics is a leading approach in realizing future quantum technologies and recently, optical waveguide circuits on silicon chips have demonstrated high levels of miniaturization and performance. Multimode interference (MMI) devices promise a straightforward implementation of compact and robust multiport circuits. Here, we show quantum interference in a 2×2 MMI coupler with visibility of V=95.6+/-0.9%. We further demonstrate the operation of a 4×4 port MMI device with photon pairs, which exhibits complex quantum interference behaviour. We have developed a new technique to fully characterize such multiport devices, which removes the need for phase-sensitive measurements and may find applications for a wide range of photonic devices. Our results show that MMI devices can operate in the quantum regime with high fidelity and promise substantial simplification and concatenation of photonic quantum circuits. |
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RPLAB @ gujma @ |
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763 |
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Author |
Kosako, Terukazu; Kadoya, Yutaka; Hofmann, Holger F. |
Title |
Directional control of light by a nano-optical Yagi–Uda antenna |
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Journal Article |
Year |
2010 |
Publication |
Nature Photonics |
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Nat. Photon. |
Volume |
4 |
Issue |
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Pages |
312 - 315 |
Keywords |
optical antennas |
Abstract |
The plasmon resonance of metal nanoparticles can direct light from optical emitters in much the same way that radiofrequency antennas direct the emission from electrical circuits. Recently, rapid progress has been made in the realization of single-element antennas for optical waves. Because most of these devices are designed to optimize the local near-field coupling between the antenna and an emitter, the possibility of modifying the spatial radiation pattern has not yet received as much attention. In the radiofrequency regime, a typical antenna design for high directivity is the Yagi–Uda antenna, which essentially consists of a one-dimensional array of antenna elements driven by a single feed element. By fabricating a corresponding array of nanoparticles, similar radiation patterns can be obtained in the optical regime. Here, we present the experimental demonstration of directional control of radiation from a nano-optical Yagi–Uda antenna composed of appropriately tuned gold nanorods. |
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RPLAB @ gujma @ |
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747 |
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Author |
Novotny, Lukas; van Hulst, Niek |
Title |
Antennas for light |
Type |
Journal Article |
Year |
2011 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
Volume |
5 |
Issue |
2 |
Pages |
83-90 |
Keywords |
optical antennas |
Abstract |
Optical antennas are devices that convert freely propagating optical radiation into localized energy, and vice versa. They enable the control and manipulation of optical fields at the nanometre scale, and hold promise for enhancing the performance and efficiency of photodetection, light emission and sensing. Although many of the properties and parameters of optical antennas are similar to their radiowave and microwave counterparts, they have important differences resulting from their small size and the resonant properties of metal nanostructures. This Review summarizes the physical properties of optical antennas, provides a summary of some of the most important recent developments in the field, discusses the potential applications and identifies the future challenges and opportunities. |
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RPLAB @ gujma @ |
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748 |
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