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Author Novotny, Lukas; van Hulst, Niek openurl 
  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 (up) 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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  Call Number RPLAB @ gujma @ Serial 748  
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Author Hu, Xiaolong; Dauler, Eric A.; Molnar, Richard J.; Berggren, Karl K. openurl 
  Title Superconducting nanowire single-photon detectors integrated with optical nano-antennae Type Journal Article
  Year 2011 Publication Optics Express Abbreviated Journal Opt. Express  
  Volume 19 Issue 1 Pages 17-31  
  Keywords optical antennas  
  Abstract (up) 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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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 745  
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Author Fazal, Furqan M.; Block, Steven M. openurl 
  Title Optical tweezers study life under tension Type Journal Article
  Year 2011 Publication Nature Photonics Abbreviated Journal Nat. Photon.  
  Volume 5 Issue 6 Pages 318-321  
  Keywords fromIPMRAS  
  Abstract (up) 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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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 776  
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Author Peruzzo, Alberto; Laing, Anthony; Politi, Alberto; Rudolph, Terry; O'Brien, Jeremy L. openurl 
  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 (up) 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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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 763  
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Author Mitin, Vladimir; Antipov, Andrei; Sergeev, Andrei; Vagidov, Nizami; Eason, David; Strasser, Gottfried openurl 
  Title Quantum Dot Infrared Photodetectors: Photoresponse Enhancement Due to Potential Barriers Type Journal Article
  Year 2011 Publication Nanoscale Research Letters Abbreviated Journal Nanoscale res lett  
  Volume 6 Issue 1 Pages 6  
  Keywords Quantum dots; Infrared detectors; Photoresponse; Doping; Potential barriers; Capture processes  
  Abstract (up) Potential barriers around quantum dots (QDs) play a key role in kinetics of photoelectrons. These barriers are always created, when electrons from dopants outside QDs fill the dots. Potential barriers suppress the capture processes of photoelectrons and increase the photoresponse. To directly investigate the effect of potential barriers on photoelectron kinetics, we fabricated several QD structures with different positions of dopants and various levels of doping. The potential barriers as a function of doping and dopant positions have been determined using nextnano3 software. We experimentally investigated the photoresponse to IR radiation as a function of the radiation frequency and voltage bias. We also measured the dark current in these QD structures. Our investigations show that the photoresponse increases ~30 times as the height of potential barriers changes from 30 to 130 meV.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 712  
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