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- Actin (2)
- Biomolecular Motors (2)
- Device (2)
- In Vitro Motility (2)
- Myosin II (2)
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- Non-volatile memory (2)
- Photoreactive Patterning (2)
- RRAM (2)
- UV/Ozone (2)
- ADD-DROP FILTERS; PROPAGATION LOSS; MICRORING RESONATORS; FABRICATION (1)
- CRYSTAL METAL NANOWIRES; LIQUID-SOLID GROWTH; NANOSCALE TWINS; STRENGTH; DEFORMATION; NUCLEATION; ELECTRODEPOSITION; DUCTILITY; ZINC (1)
- Ferromagnetic materials (1)
- Magnetic particles (1)
- Micro-resonator; Si waveguide; transition loss (1)
- Nanomagnetics (1)
- Nanoparticles (1)
- Nanotechnology (1)
- ON-INSULATOR TECHNOLOGY; WAVE-GUIDES; RESONATOR; NANOMEMBRANES; LITHOGRAPHY; ELECTRONICS; CIRCUITS; WIRE (1)
- OPTICAL FREQUENCY COMBS; GENERATION; MICRORESONATOR; RESONATOR; MICROCAVITY; MODE; CHIP (1)
- WAVE-FORM GENERATION; PHASE MODULATORS; SPECTROMETER; RESONATOR; LASERS; TIME (1)
- WAVE-GUIDES; RING RESONATORS; BISTABILITY; CHIP; NONLINEARITIES; PROPAGATION; ISOLATOR; FILTERS; FIBER (1)
Articles 1 - 11 of 11
Full-Text Articles in Nanoscience and Nanotechnology
Direction-Tunable Nanotwins In Copper Nanowires By Laser-Assisted Electrochemical Deposition, Zhikun Liu, Yuefeng Wang, Yiliang Liao, Gary Cheng
Direction-Tunable Nanotwins In Copper Nanowires By Laser-Assisted Electrochemical Deposition, Zhikun Liu, Yuefeng Wang, Yiliang Liao, Gary Cheng
Yuefeng Wang
Nanotwins can improve mechanical strength and maintain high electrical conductivity in metallic nanowires. We demonstrated a method of pulsed-laser-assisted electrodeposition, which could form dense nanotwins with tunable directions in copper nanowires of uniform sizes. Transmission electron microscopy characterization showed with a growth potential of -0.2 V, nanotwins tend to align along the longitudinal direction of the nanowires, whereas at a larger potential of -0.8 V, nanotwins of {111}/< 112 > type perpendicular to the longitudinal direction of the wire were formed. The two types of nanotwins were investigated by comparing the microstructures under different electrochemical conditions and laser irradiation energies. Two different …
A Taper To Reduce The Straight-To-Bend Transition Loss In Compact Silicon Waveguides, Hao Shen, Li Fan, Jian Wang, Justin Wirth, Minghao Qi
A Taper To Reduce The Straight-To-Bend Transition Loss In Compact Silicon Waveguides, Hao Shen, Li Fan, Jian Wang, Justin Wirth, Minghao Qi
Jian Wang
Strong confinement of light in silicon waveguides allows for sharp bends and, as a result, high-density integration. However, the mode transition loss between the straight and bent portions of a silicon waveguide begins to affect the device performance when the bending radius becomes small. In this letter, we show that a transition region with a step taper between the straight and bent portions of the waveguide can effectively reduce this transition loss. This is demonstrated by measuring the intrinsic round-trip losses of micro-racetrack resonators, where ultralow loss can be precisely characterized according to the quality (Q)-factor change. The results show …
Direct Fabrication Of Silicon Photonic Devices On A Flexible Platform And Its Application For Strain Sensing, Li Fan, Leo Varghese, Yi Xuan, Jian Wang, Ben Niu, Minghao Qi
Direct Fabrication Of Silicon Photonic Devices On A Flexible Platform And Its Application For Strain Sensing, Li Fan, Leo Varghese, Yi Xuan, Jian Wang, Ben Niu, Minghao Qi
Jian Wang
We demonstrate a process to fabricate silicon photonic devices directly on a plastic film which is both flexible and transparent. This process allows the integration of complex structures on plastic films without the need of transferring from another substrate. Waveguides, grating couplers, and microring resonators are fabricated and optically characterized. An optical strain sensor is shown as an application using 5 mu m-radius microring resonators on the flexible substrate. When strain is applied, resonance wavelength shifts of the microring resonators are observed. Contributions of different effects are analyzed and evaluated. Finally, we measure the influence of residual strain and confirm …
An All-Silicon Passive Optical Diode, Li Fan, Jian Wang, Leo Varghese, Hao Shen, Ben Niu, Yi Xuan, Andrew Weiner, Minghao Qi
An All-Silicon Passive Optical Diode, Li Fan, Jian Wang, Leo Varghese, Hao Shen, Ben Niu, Yi Xuan, Andrew Weiner, Minghao Qi
Jian Wang
A passive optical diode effect would be useful for on-chip optical information processing but has been difficult to achieve. Using a method based on optical nonlinearity, we demonstrate a forward-backward transmission ratio of up to 28 decibels within telecommunication wavelengths. Our device, which uses two silicon rings 5 micrometers in radius, is passive yet maintains optical nonreciprocity for a broad range of input power levels, and it performs equally well even if the backward input power is higher than the forward input. The silicon optical diode is ultracompact and is compatible with current complementary metal-oxide semiconductor processing.
Observation Of Correlation Between Route To Formation, Coherence, Noise, And Communication Performance Of Kerr Combs, Pei-Hsun Wang, Fahmida Ferdous, Houxun Miao, Jian Wang, Daniel Leaird, Kartik Srinivasan, Lei Chen, Vladimir Aksyuk, Andrew Weiner
Observation Of Correlation Between Route To Formation, Coherence, Noise, And Communication Performance Of Kerr Combs, Pei-Hsun Wang, Fahmida Ferdous, Houxun Miao, Jian Wang, Daniel Leaird, Kartik Srinivasan, Lei Chen, Vladimir Aksyuk, Andrew Weiner
Jian Wang
Microresonator optical frequency combs based on cascaded four-wave mixing are potentially attractive as a multi-wavelength source for on-chip optical communications. In this paper we compare time domain coherence, radio-frequency (RF) intensity noise, and individual line optical communications performance for combs generated from two different silicon nitride microresonators. The comb generated by one microresonator forms directly with lines spaced by a single free spectral range (FSR) and exhibits high coherence, low noise, and excellent 10 Gbit/s optical communications results. The comb generated by the second microresonator forms initially with multiple FSR line spacing, with additional lines later filling to reach single …
Spectral Line-By-Line Pulse Shaping Of On-Chip Microresonator Frequency Combs, Fahmida Ferdous, Houxun Miao, Daniel Leaird, Kartik Srinivasan, Jian Wang, Lei Chen, Leo Tom Varghese, Andrew Weiner
Spectral Line-By-Line Pulse Shaping Of On-Chip Microresonator Frequency Combs, Fahmida Ferdous, Houxun Miao, Daniel Leaird, Kartik Srinivasan, Jian Wang, Lei Chen, Leo Tom Varghese, Andrew Weiner
Jian Wang
Recently, on-chip comb generation methods based on nonlinear optical modulation in ultrahigh-quality-factor monolithic microresonators have been demonstrated, where two pump photons are transformed into sideband photons in a four-wave-mixing process mediated by Kerr nonlinearity. Here, we investigate line-by-line pulse shaping of such combs generated in silicon nitride ring resonators. We observe two distinct paths to comb formation that exhibit strikingly different time-domain behaviours. For combs formed as a cascade of sidebands spaced by a single free spectral range that spread from the pump, we are able to compress stably to nearly bandwidth-limited pulses. This indicates high coherence across the spectra …
Tuning The Magnetostructural Phase Transition In Ferh Nanocomposites, Radhika Barua, Xiujuan Jiang, Felix Jiménez-Villacorta, J. Shield, D. Heiman, L. Lewis
Tuning The Magnetostructural Phase Transition In Ferh Nanocomposites, Radhika Barua, Xiujuan Jiang, Felix Jiménez-Villacorta, J. Shield, D. Heiman, L. Lewis
Donald Heiman
Effects of nanostructuring on the magnetostructural response of the near-equiatomic FeRh phase were investigated in nanocomposite materials synthesized by rapid solidification and subsequent annealing of an alloy of nominal atomic composition (FeRh)5Cu95. Transmission electron microscopy studies confirm attainment of a phase-separated system of nanoscaled (∼10–15 nm diameter) precipitates, consistent with FeRh embedded in a Cu matrix. These nanoprecipitates are crystallographically aligned with the coarse-grained Cu matrix and possess an L10-type (CuAu 1) structure, in contrast to the B2 (CsCl)-type structure of bulk FeRh. It is proposed that the face-centered cubic crystal structure of the …
Assembly And Function Of Myosin Ii On Ultraviolet/Ozone Patterned Trimethylchlorosilane Substrates, Hideyo Takatsuki, Madhukar Kolli, Kevin Rice, B. Day, Shinichi Asano, Mashiur Rahman, Yue Zhang, Ryoki Ishikawa, Kazuhiro Kohama, Eric Blough
Assembly And Function Of Myosin Ii On Ultraviolet/Ozone Patterned Trimethylchlorosilane Substrates, Hideyo Takatsuki, Madhukar Kolli, Kevin Rice, B. Day, Shinichi Asano, Mashiur Rahman, Yue Zhang, Ryoki Ishikawa, Kazuhiro Kohama, Eric Blough
Kevin M Rice
The study of biomolecular motors represents a rapidly and progressing field of nanobiotechnology. Here, we present a simple method for patterning myosin II on a microstructured surface. Our findings indicate that UV/ozone treatment can be used to alter the hydrophobicity of trimethyl-chloro-silane (TMCS) coated glass surfaces, to alter protein binding, and effectively produce localized motor activity. Taken together, these data suggest that photoreactive patterning may be useful for the selective localization of functional myosin II motor tracks.
Cause And Prevention Of Moisture-Induced Degradation Of Resistance Random Access Memory Nanodevices, Albert Chen
Cause And Prevention Of Moisture-Induced Degradation Of Resistance Random Access Memory Nanodevices, Albert Chen
Albert B Chen
Dielectric thin films in nanodevices may absorb moisture, leading to physical changes and property/performance degradation, such as altered data storage and readout in resistance random access memory. Here we demonstrate using a nanometallic memory that such degradation proceeds via nanoporosity, which facilitates water wetting in otherwise nonwetting dielectrics. Electric degradation only occurs when the device is in the charge-storage state, which provides a nanoscale dielectrophoretic force directing H2O to internal field centers (sites of trapped charge) to enable bond rupture and charged hydroxyl formation. While these processes are dramatically enhanced by an external DC or AC field and electron-donating electrodes, …
Assembly And Function Of Myosin Ii On Ultraviolet/Ozone Patterned Trimethylchlorosilane Substrates, Hideyo Takatsuki, Madhukar Kolli, Kevin Rice, B. Day, Shinichi Asano, Mashiur Rahman, Yue Zhang, Ryoki Ishikawa, Kazuhiro Kohama, Eric Blough
Assembly And Function Of Myosin Ii On Ultraviolet/Ozone Patterned Trimethylchlorosilane Substrates, Hideyo Takatsuki, Madhukar Kolli, Kevin Rice, B. Day, Shinichi Asano, Mashiur Rahman, Yue Zhang, Ryoki Ishikawa, Kazuhiro Kohama, Eric Blough
Eric Blough
The study of biomolecular motors represents a rapidly and progressing field of nanobiotechnology. Here, we present a simple method for patterning myosin II on a microstructured surface. Our findings indicate that UV/ozone treatment can be used to alter the hydrophobicity of trimethyl-chloro-silane (TMCS) coated glass surfaces, to alter protein binding, and effectively produce localized motor activity. Taken together, these data suggest that photoreactive patterning may be useful for the selective localization of functional myosin II motor tracks.
Demonstration And Modeling Of Multi-Bit Resistance Random Access Memory, Albert Chen
Demonstration And Modeling Of Multi-Bit Resistance Random Access Memory, Albert Chen
Albert B Chen
Although intermediates resistance states are common in resistance random access memory (RRAM), two-way switching among them has not been demonstrated. Using a nanometallic bipolar RRAM, we have illustrated a general scheme for writing/rewriting multi-bit memory using voltage pulses. Stability conditions for accessing intermediate states have also been determined in terms of a state distribution function and the weight of serial load resistance. A multi-bit memory is shown to realize considerable space saving at a modest decrease of switching speed.