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https://www.readbyqxmd.com/read/28340296/ultra-low-surface-recombination-velocity-in-passivated-ingaas-inp-nanopillars
#1
Aura Higuera-Rodriguez, Bruno Romeira, Simone Birindelli, Lachlan E Black, Barry Smalbrugge, Peter J van Veldhoven, Wilhelmus Erwin M M Kessels, Meint K Smit, Andrea Fiore
The III-V semiconductor InGaAs is a key material for photonics since it provides optical emission and absorption in the 1.55 μm telecommunication wavelength window. However, InGaAs suffers from pronounced non-radiative effects associated with its surface states, which affect the performance of nanophotonic devices for optical interconnects, namely nanolasers and nanodetectors. This work reports the strong suppression of surface recombination of undoped InGaAs/InP nanostructured semiconductor pillars using a combination of ammonium sulfide, (NH4)2S, passivation and silicon oxide, SiOx, coating...
March 24, 2017: Nano Letters
https://www.readbyqxmd.com/read/28300145/high-photoresponsivity-ge-dot-photomosfets-for-low-power-monolithically-integrated-si-optical-interconnects
#2
Ming-Hao Kuo, Meng-Chun Lee, Horng-Chih Lin, Tom George, Pei-Wen Li
We report the demonstration of high-photoresponsivity Ge-dot photoMOSFETs in a standard MOS configuration for the detection of 850-1550 nm illumination. Each device has a self-organized, gate-stacking heterostructure of SiO2/Ge-dot/SiO2/SiGe-channel which is simultaneously fabricated in a single oxidation step. Superior control of the geometrical size and chemical composition for our Ge nanodots/SiO2/Si1-xGex-shell MOS structure enables the practically-achievable, gate-stacking design for our Ge-dot photoMOSFETs...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28287215/investigation-on-the-thermal-effects-of-nayf4-er-under-1550-nm-irradiation
#3
Hong Wang, Xiumei Yin, Mingming Xing, Yao Fu, Ying Tian, Xin Feng, Tao Jiang, Xixian Luo
The thermal effects of NaYF4:Er microcrystals under 1550 nm laser diode irradiation were investigated using an infrared thermal imaging method. The results revealed that the temperature of the LD irradiation beam area was non-uniform. The NaYF4:Er sample exhibits a rapid temperature increase within 5-10 s, and the heating process reaches its steady state after 60 s of irradiation when exposed to 1550 nm LD. The response time, temperature increase, and emission intensity of the samples depend on the excitation power density and concentration of doped Er(3+) ions...
March 13, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28266835/infrared-plasmonics-with-conductive-ternary-nitrides
#4
Chryssoula Metaxa, Spyros Kassavetis, Jean Francois Pierson, D Gall, Panos Patsalas
Conductive transition metal nitrides are emerging as promising alternative plasmonic materials that are refractory and CMOS-compatible. In this work, we show that ternary transition metal nitrides of the B1 structure and consisting of a combination of group-IVb transition metal, such as Ti or Zr, and group III (Sc, Y, Al) or group II (Mg, Ca) elements can have tunable plasmonic activity in the infrared range in contrast to Ta-based ternary nitrides, which exhibit plasmonic performance in the visible and UV ranges...
March 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28249505/electro-optic-modulation-of-a-laser-at-microwave-frequencies-for-interferometric-purposes
#5
Paul E Specht, Brook A Jilek
A multi-point microwave interferometer (MPMI) concept was previously proposed by the authors for spatially-resolved, non-invasive tracking of a shock, reaction, or detonation front in energetic media [P. Specht et al., AIP Conf. Proc. 1793, 160010 (2017).]. The advantage of the MPMI concept over current microwave interferometry techniques is its detection of Doppler shifted microwave signals through electro-optic (EO) modulation of a laser. Since EO modulation preserves spatial variations in the Doppler shift, collecting the EO modulated laser light into a fiber array for recording with an optical heterodyne interferometer yields spatially-resolved velocity information...
February 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28241601/slow-light-in-mass-produced-dispersion-engineered-photonic-crystal-ring-resonators
#6
Kathleen McGarvey-Lechable, Tabassom Hamidfar, David Patel, Luhua Xu, David V Plant, Pablo Bianucci
We present experimental results of photonic crystal ring resonators (PhCRRs) fabricated on the CMOS-compatible, silicon-on-insulator platform via 193-nm deep-UV lithography. Our dispersion-engineering design approach is compared to experimental results, showing very good agreement between theory and measurements. Specifically, we report a mean photonic band-edge wavelength of 1546.2 ± 5.8 nm, a 0.2% variation from our targeted band-edge wavelength of 1550 nm. Methods for the direct calculation of the experimental, discrete dispersion relation and extraction of intrinsic quality factors for a highly-dispersive resonator are discussed...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28240245/spectral-compression-of-single-photon-level-laser-pulse
#7
Yuanhua Li, Tong Xiang, Yiyou Nie, Minghuang Sang, Xianfeng Chen
We experimentally demonstrate that the bandwidth of single photons laser pulse is compressed by a factor of 58 in a periodically poled lithium niobate (PPLN) waveguide chip. A positively chirped single photons laser pulse and a negatively chirped classical laser pulse are employed to produce a narrowband single photon pulse with new frequency through sum-frequency generation. In our experiment, the frequency and bandwidth of single photons at 1550 nm are simultaneously converted. Our results mark a critical step towards the realization of coherent photonic interface between quantum communication at 1550 nm and quantum memory in the near-visible window...
February 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28221297/optimal-epinephrine-concentration-and-time-delay-to-minimize-perfusion-in-eyelid-surgery-measured-by-laser-based-methods-and-a-novel-form-of-extended-wavelength-diffuse-reflectance-spectroscopy
#8
Rafi Sheikh, Ulf Dahlstrand, Khashayar Memarzadeh, Jonas Blohmé, Nina Reistad, Malin Malmsjö
OBJECTIVE: This study investigates the hypoperfusion effects of epinephrine in local anesthesia in eyelid surgery. A novel form of extended-wavelength diffuse reflectance spectroscopy was evaluated. METHODS: Blood perfusion in porcine eyelid flaps was measured using laser Doppler velocimetry and laser speckle contrast imaging, whereas the tissue response was measured using diffuse reflectance spectroscopy with a broad spectrum (450-1550 nm). Epinephrine was either injected cumulatively, 0...
February 17, 2017: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28218652/steady-%C3%AE-ray-effects-on-the-performance-of-ppp-botda-and-tw-cotdr-fiber-sensing
#9
Isabelle Planes, Sylvain Girard, Aziz Boukenter, Emmanuel Marin, Sylvie Delepine-Lesoille, Claude Marcandella, Youcef Ouerdane
We investigated the evolution of the performances of Pulse Pre Pump-Brillouin Time Domain Analysis (PPP-BOTDA) and Tunable Wavelength Coherent Optical Time Domain Reflectometry (TW-COTDR) fiber-based temperature and strain sensors when the sensing optical fiber is exposed to two γ-ray irradiation conditions: (i) at room temperature and a dose rate of 370 Gy(SiO2)/h up to a total ionizing dose (TID) of 56 kGy; (ii) at room temperature and a dose rate of 25 kGy(SiO2)/h up to a TID of 10 MGy. Two main different classes of single-mode optical fibers have been tested in situ, radiation-tolerant ones: fluorine-doped or nitrogen-doped core fibers, as well as Telecom-grade germanosilicate ones...
February 17, 2017: Sensors
https://www.readbyqxmd.com/read/28210188/non-contact-photoacoustic-imaging-using-a-commercial-heterodyne-interferometer
#10
Chao Tian, Ting Feng, Cheng Wang, Shengchun Liu, Qian Cheng, David E Oliver, Xueding Wang, Guan Xu
Most current photoacoustic imaging (PAI) systems employ piezoelectric transducers to receive photoacoustic signals, which requires coupling medium to facilitate photoacoustic wave propagation and are not favored in many applications. Here, we report an all-optical non-contact PAI system based on a commercial heterodyne interferometer working at 1550 nm. The interferometer remotely detects ultrasound-induced surface vibration and does not involve any physical contact with the sample. The theoretically predicated and experimentally measured noise equivalent detection limits of the optical sensor are about 4...
December 1, 2016: IEEE Sensors Journal
https://www.readbyqxmd.com/read/28182411/solvothermal-synthesis-of-cu2sns3-quantum-dots-and-their-application-in-near-infrared-photodetectors
#11
Sandra Dias, Kishan Kumawat, Shinjini Biswas, Salaru Babu Krupanidhi
Cu2SnS3 (CTS) quantum dots were synthesized by solvothermal technique with poly(vinylpyrrolidone) (PVP) as a surfactant. The structural and optical properties were studied using X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-vis spectroscopy. The electronic band gap was measured using cyclic voltammetry. The infrared photoresponse of the CTS quantum dots-incorporated device was measured under different illumination intensities of the infrared lamp, 1550 and 1064 nm lasers...
February 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28157969/second-order-few-mode-raman-amplifier-for-mode-division-multiplexed-optical-communication-systems
#12
Jiaxiong Li, Jiangbing Du, Lin Ma, Ming-Jun Li, Ke Xu, Zuyuan He
We experimentally demonstrate and investigate, for first time to our best knowledge, a second-order few-mode Raman amplifier for low noise distributed fiber amplification. The 1455 and 1360 nm pumps are both injected into the few-mode fiber (FMF) in the forms of two degenerate LP<sub>11</sub> modes in the backward direction. Within the band from 1542 to 1558 nm, maximum on-off gains of 4 dB are achieved for both LP<sub>01</sub> and LP<sub>11</sub> modes, and the differential modal gain (DMG) is less than 0...
January 23, 2017: Optics Express
https://www.readbyqxmd.com/read/28157957/towards-chip-scale-optical-frequency-synthesis-based-on-optical-heterodyne-phase-locked-loop
#13
Shamsul Arafin, Arda Simsek, Seong-Kyun Kim, Sarvagya Dwivedi, Wei Liang, Danny Eliyahu, Jonathan Klamkin, Andrey Matsko, Leif Johansson, Lute Maleki, Mark Rodwell, Larry Coldren
An integrated heterodyne optical phase-locked loop was designed and demonstrated with an indium phosphide based photonic integrated circuit and commercial off-the-shelf electronic components. As an input reference, a stable microresonator-based optical frequency comb with a 50-dB span of 25 nm (~3 THz) around 1550 nm, having a spacing of ~26 GHz, was used. A widely-tunable on-chip sampled-grating distributed-Bragg-reflector laser is offset locked across multiple comb lines. An arbitrary frequency synthesis between the comb lines is demonstrated by tuning the RF offset source, and better than 100Hz tuning resolution with ± 5 Hz accuracy is obtained...
January 23, 2017: Optics Express
https://www.readbyqxmd.com/read/28146532/upconversion-imaging-using-short-wave-infrared-picosecond-pulses
#14
Morgan Mathez, Peter John Rodrigo, Peter Tidemand-Lichtenberg, Christian Pedersen
To the best of our knowledge, we present the first demonstration of short-wavelength infrared image upconversion that employs intense picosecond signal and pump beams. We use a fiber laser that emits a signal beam at 1877 nm and a pump beam at 1550 nm-both with a pulse width of 1 ps and a pulse repetition rate of 21.7 MHz. Due to synchronization of high peak-power pulses, efficient upconversion is achieved in a single-pass setup that employs a bulk lithium niobate crystal. Optimizing the temporal overlap of the pulses for high upconversion efficiency enables us to exploit a relatively large pump beam diameter to upconvert a wider range of signal spatial frequencies in the crystal...
February 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28059394/potential-of-a-superconducting-photon-counter-for-heterodyne-detection-at-the-telecommunication-wavelength
#15
M Shcherbatenko, Y Lobanov, A Semenov, V Kovalyuk, A Korneev, R Ozhegov, A Kazakov, B M Voronov, G N Goltsman
Here, we report on the successful operation of a NbN thin film superconducting nanowire single-photon detector (SNSPD) in a coherent mode (as a mixer) at the telecommunication wavelength of 1550 nm. Providing the local oscillator power of the order of a few picowatts, we were practically able to reach the quantum noise limited sensitivity. The intermediate frequency gain bandwidth (also referred to as response or conversion bandwidth) was limited by the spectral band of a single-photon response pulse of the detector, which is proportional to the detector size...
December 26, 2016: Optics Express
https://www.readbyqxmd.com/read/28059316/all-optical-tuning-of-eit-like-dielectric-metasurfaces-by-means-of-chalcogenide-phase-change-materials
#16
E Petronijevic, C Sibilia
Electromagnetically induced transparency (EIT) is a pump-induced narrowband transparency window within an absorption line of the probe beam spectrum in an atomic system. In this paper we propose a way to bring together the all-dielectric metamaterials to have EIT-like effects and to optically tune the response by hybridizing them with a layer of a phase change material. We propose a design of the metamaterial based on Si nanoresonators that can support an EIT-like resonant response. On the top of the resonators we consider a thin layer of a chalcogenide phase change material, which we will use to tune the optical response...
December 26, 2016: Optics Express
https://www.readbyqxmd.com/read/28059272/graphene-based-side-polished-optical-fiber-amplifier
#17
Mohammad Karimi, Vahid Ahmadi, Masoud Ghezelsefloo
We demonstrate a novel design for optical fiber amplifiers, utilizing side-polished fibers with a single-layer graphene overlay as the active medium and carrier injection in the graphene layer to provide the required inversion. We study the effects of an electrically induced graphene p-i-n heterojunction in the forward bias regime on optical modes of side-polished fibers and show that gain values of 0.51, 1.81, and 1.79 dB/cm for wavelengths 1064, 1330, and 1550 nm can be obtained for single-mode side-polished fibers...
December 20, 2016: Applied Optics
https://www.readbyqxmd.com/read/28059250/giant-nonlinear-absorption-and-excited-carrier-dynamics-of-black-phosphorus-few-layer-nanosheets-in-broadband-spectra
#18
Runze Chen, Yuhua Tang, Xin Zheng, Tian Jiang
Layered black phosphorus nanosheets (BPNs) offer potential uses in nanoelectronic and photonics applications. This work demonstrates giant saturable absorption (SA) and two-photon absorption (TPA) of BPNs under femtosecond visible-to-mid-infrared laser-pulse excitation. In addition, the excited carrier dynamics of BPNs were also studied with ultrafast pump-probe technology. Measurements demonstrated that the nonlinear absorption properties of BPNs strongly depend on excitation wavelength and intensity. BPNs moved from SA to TPA under increasing laser intensities at 800, 1160, 1300, and 1550 nm but showed a purely TPA response at 2000 nm, as gauged by measuring BPN nonlinear absorption coefficients...
December 20, 2016: Applied Optics
https://www.readbyqxmd.com/read/28059212/large-scale-silicon-nitride-nanophotonic-phased-arrays-at-infrared-and-visible-wavelengths
#19
Christopher V Poulton, Matthew J Byrd, Manan Raval, Zhan Su, Nanxi Li, Erman Timurdogan, Douglas Coolbaugh, Diedrik Vermeulen, Michael R Watts
We demonstrate passive large-scale nanophotonic phased arrays in a CMOS-compatible silicon photonic platform. Silicon nitride waveguides are used to allow for higher input power and lower phase variation compared to a silicon-based distribution network. A phased array at an infrared wavelength of 1550 nm is demonstrated with an ultra-large aperture size of 4  mm×4  mm, achieving a record small and near diffraction-limited spot size of 0.021°×0.021° with a side lobe suppression of 10 dB. A main beam power of 400 mW is observed...
January 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28058285/large-hyperpolarizabilities-at-telecommunication-relevant-wavelengths-in-donor-acceptor-donor-nonlinear-optical-chromophores
#20
Animesh Nayak, Jaehong Park, Kurt De Mey, Xiangqian Hu, Timothy V Duncan, David N Beratan, Koen Clays, Michael J Therien
Octopolar D2-symmetric chromophores, based on the MPZnM supermolecular motif in which (porphinato)zinc(II) (PZn) and ruthenium(II) polypyridyl (M) structural units are connected via ethyne linkages, were synthesized. These structures take advantage of electron-rich meso-arylporphyrin or electron-poor meso-(perfluoroalkyl)porphyrin macrocycles, unsubstituted terpyridyl and 4'-pyrrolidinyl-2,2';6',2″-terpyridyl ligands, and modulation of metal(II) polypyridyl-to-(porphinato)zinc connectivity, to probe how electronic and geometric factors impact the measured hyperpolarizability...
December 28, 2016: ACS Central Science
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