broadband

Monolithic Broadband InGaN Light-Emitting Diode

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Monolithic Broadband InGaN Light-Emitting Diode by Cong Feng, Jian-An Huang, Hoi Wai Choi.

A monolithic nonphosphor broadband-emission light-emitting diode is demonstrated, comprising a combination of high-density microstructured and nanostructured InGaN-GaN quantum wells fabricated using top-down approach. Broadband emission achieved by taking advantage low-dimensional-induced strain-relaxation highly strained wells, combining light emitted from strain-relaxed nanotips at wavelengths shorter than the as-grown as much 80 nm with longer-wavelength larger nonrelaxed microdisks. The localized characteristics have been studied spatially resolved near-field photoluminescence spectroscopy which enabled both intensity spectrum individual to be distinguished larger-dimensioned regions. Distinctive blue-green-yellow can observed electroluminescent device, whose continuous broadband characterized CIE coordinates (0.39, 0.47) color rendering in…

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Simultaneous effects of sinusoidal whole body vibration and broadband noise on TTS2’s and R-wave amplitudes in men at two different dry bulb temperatures

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Simultaneous effects of sinusoidal whole body vibration and broadband noise on TTS2’s and R-wave amplitudes in men at two different dry bulb temperatures by Olavi Manninen.

The aim of this study was to investigate the temporary hearing threshold shift (TTS2) and R-wave amplitudes in eleven healthy males when they were exposed paired sinusoidal whole body (Z-axis) vibration (5 Hz–2.12 m/s2) stable broadband A-weighted white noise at dry bulb temperatures 20 degrees C 30 C. intensity exposure combinations 75, 85 95 dB(A). total number tests 66, carried out an chamber. subjects dressed standard clothing, simple tasks using a choice reaction time device during test. According results, means TTS2 values usually higher temperature than Hearing shifts greatest frequencies 4 6 kHz, smallest 8 kHz. more intense combination vibration, clearer tendency for increase ambient accelerate threshold. effect on also appeared be slightly stronger successive cycles. Changes seemed connected with those decrease amplitude values, especially simultaneously dB(A) This implies that intensifies cardiovascular disturbances body, which development functional disturbance inner ear.

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Broadband self-switching of femtosecond pulses in highly nonlinear high index contrast dual-core fibre

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Broadband self-switching of femtosecond pulses in highly nonlinear high index contrast dual-core fibre by M. Longobucco, Ignas Astrauskas, Audrius Pugžlys, Dariusz Pysz, Frantisek Uherek, Andrius Baltuška, Ryszard Buczynski, I. Bugar.

In this paper, we demonstrate a pulse energy-governed nonlinear self-switching of femtosecond pulses at wavelength 1700 nm in highly high index contrast dual-core fibre. The fibre structure is composed two microdimension cores and solid cladding made thermally matched soft glasses developed in-house. A double switching behaviour under monotonic increase the input energy from 1 nJ to 3 was observed 35 mm length its anomalous dispersion region. spatial intensity distribution measurement identified 16.7 dB, registered spectra output channels revealed broadband within 150 nm. obtained results indicate novel type solitonic represent significant progress comparison previous experimental works has application potential.

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Precise method for angular alignment of birefringent fibers based on an interferometric technique with a broadband source

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Precise method for angular alignment of birefringent fibers based on an interferometric technique with a broadband source by Kazumasa Takada, Kazunori Chida, Juichi Noda.

A new method for precisely aligning the principal axes between two birefringent fibers is presented using a Michelson interferometer and broadband source. Angular alignment can be accomplished by measuring interference peak value corresponding to rotation angle of fibers. accuracy limited mode coupling produced near connection with reduced dependence on fiber crosstalk. Following experiment, minimum angular misalignment was +/-0.086 degrees , which corresponds -56-dB crosstalk at connection.

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A Novel Analog Photonic Method for Broadband Multipath Interference Cancellation

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A Novel Analog Photonic Method for Broadband Multipath Interference Cancellation by John Chang, Paul R. Prucnal.

A novel analog optical technique for multipath interference cancellation of broadband signals is proposed. Multiple compensation branches are utilized to replicate wireless channel effects. The duplicated signal subtracted from the total received recover interest while suppressing interference. proposed architecture achieved 40 dB over 200 MHz and 50 10 MHz. depth nature demonstrates precision components validity our scheme.

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Broadband All-Dielectric Magnifying Lens for Far-Field High-Resolution Imaging

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Broadband All-Dielectric Magnifying Lens for Far-Field High-Resolution Imaging by Wei Xiang Jiang, Cheng-Wei Qiu, Tiancheng Han, Qiang Cheng, Hui Feng Ma, Shuang Zhang, Tie Jun Cui.

A transformation-optics magnifying lens is reported in the microwave frequency, which made of inhomogeneous but isotropic dielectrics to reach impedance matching. The authors demonstrate broadband subwavelength imaging performance and magnification factor experimentally from far-field radiation patterns.

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Automatically Acquired Broadband Plasmonic-Metamaterial Black Absorber during the Metallic Film-Formation

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Automatically Acquired Broadband Plasmonic-Metamaterial Black Absorber during the Metallic Film-Formation by Zhengqi Liu, Xiaoshan Liu, Shan Huang, Pingping Pan, Jing M. Chen, Guiqiang Liu, Gang Gu.

Broadband electromagnetic wave absorbers are highly desirable in numerous applications such as solar-energy harvesting, thermo-photovoltaics, and photon detection. The aim to efficiently achieve ultrathin broadband with high-yield low-cost fabrication process has long been pursued. Here, we theoretically propose experimentally demonstrate a unique plasmonic-metamaterial absorber by utilizing sub-10 nm meta-surface film structure replace the precisely designed metamaterial crystal common metal-dielectric-metal absorbers. can be automatically obtained during metal formation process. Spectral bandwidth absorbance above 80% is up 396 nm, where full absorption width at half-maximum about 92%. average value of across whole spectral range 370-880 reaches 83%. These super properties attributed particle plasmon resonances near-field coupling formed metallic nanoparticles well polaritons induced plasmonic magnetic occurring between top bottom mirror. This method quite simple, cost-effective for large-area fabrication, compatible current industrial methods microelectro-mechanical systems, which makes it an outstanding candidate advanced high-efficiency materials.

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System quality, user satisfaction, and perceived net benefits of mobile broadband services

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System quality, user satisfaction, and perceived net benefits of mobile broadband services by Eunice Hsiao-Hui Wang, Chao-Yu Chen.

The continued decline of voice revenues is pushing mobile operators in Taiwan turn into data and content services for exploring new revenue opportunities raising ARPU. This study aims to discuss the critical determinants internet user’s adoption 3.5G broadband Taiwan. theoretical framework employed Information System Success Model (DeLone & McLean, 2003; Chae et al.,2002), which operationally defined with web-services measurement scales. attempts identify how system quality affects customer satisfaction their perceived net benefit. With affordable connectivity, 3.5 G access or HSDPA has played a major role burgeoning Internet market. (High Speed Downlink Packet Access) could be viewed as an advanced version WCDMA wireless network. ideally provides up 14.4 Mbps downlinks 5.8 uplinks. According TWNIC, number cell phone subscribers grown 23 million by March 2009 100% penetration rate Yet, among there were only 1.6 users adopting services.

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Aural discrimination of target echoes in white noise by human observers using broadband sonar pulses

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Aural discrimination of target echoes in white noise by human observers using broadband sonar pulses by Whitlow W. L. Au, Douglas W. Martin.

Sonar echo‐discrimination performances were measured as a function of S/N with three human observers. Targets included hollow cylinders aluminum and glass having diameters 3.81 7.62 cm, solid 7.62‐cm cylinder. The subjects required to discriminate between the cylinders, cylinders. Digital recordings target echoes obtained using dolphin‐like echolocation signals, played back at 150 original sample rate. slope psychometric for solid‐hollow discrimination was approximately 2.2% correct/dB, 0.7 1.3% correct/dB aluminum‐glass discrimination. average 75% correct response threshold occurred 22 dB discrimination, 42 detection cylinder 11 one subjects, indica…

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