- 标题
- 摘要
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- 实验方案
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Demonstration of scalable microring weight bank control for large-scale photonic integrated circuits
摘要： Microring resonators (MRRs) are reconfigurable optical elements ubiquitous in photonic integrated circuits. Owing to its high sensitivity, MRR control is very challenging, especially in large-scale optical systems. In this work, we experimentally demonstrate continuous, multi-channel control of MRR weight banks using simple calibration procedures. A record-high accuracy and precision are achieved for all the controlled MRRs with negligible inter-channel crosstalk. Our approach allows accurate transmission calibration without the need for direct access to the output of the microring weight bank and without the need to lay out electrical and optical I/Os specific for calibration purpose. These features mean that our MRR control approach can be applied to large-scale photonic integrated circuits while maintaining its accuracy with manageable cost of chip area and I/O complexity.
关键词： weight banks,Microring resonators,silicon photonics,photonic integrated circuits,optical control
更新于2025-09-23 15:21:01
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Guided by light: optogenetic control of microtubule gliding assays
摘要： Force generation by molecular motors drives biological processes such as asymmetric cell division and cell migration. Microtubule gliding assays, in which surface-immobilized motor proteins drive microtubule propulsion, are widely used to study basic motor properties as well as the collective behavior of active self-organized systems. Additionally, these assays can be employed for nanotechnological applications such as analyte detection, bio-computation and mechanical sensing. While such assays allow tight control over the experimental conditions, spatiotemporal control of force generation has remained underdeveloped. Here we use light-inducible protein-protein interactions to recruit molecular motors to the surface to control microtubule gliding activity in vitro. We show that using these light-inducible interactions, proteins can be recruited to the surface in patterns, reaching a ~5-fold enrichment within 6 seconds upon illumination. Subsequently, proteins are released with a half-life of 13 seconds when the illumination is stopped. We furthermore demonstrate that light-controlled kinesin recruitment results in reversible activation of microtubule gliding along the surface, enabling efficient control over local microtubule motility. Our approach to locally control force generation offers a way to study the effects of non-uniform pulling forces on different microtubule arrays and also provides novel strategies for local control in nanotechnological applications.
关键词： motor proteins,optogenetics,optical control,Microtubules
更新于2025-09-23 15:21:01
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Optical control of layered nanomaterial generation by pulsed-laser ablation in liquids
摘要： Pulsed-laser ablation in liquids capitalizes on combining chemical and optical control to rapidly generate size, composition, and phase-controlled nanostructures, without the need for surfactants. Very high temperatures, which we determined to be ca. (8,400 ± 1,300) K, pressures, and ion densities exist in the laser-induced liquid-confined plasma. These unique conditions, coupled with the rapid cooling during which nanoparticles are formed, permitted access to new extreme regions of materials’ phase diagrams. This way, we produced metastable layered copper and zinc hydroxide-based nanocrystals with interesting physical properties that can serve as precursors for two-dimensional inorganic semiconductor nanomaterials.
关键词： LTE spectra,optical control,electron temperature,layered nanocrystals,Pulsed-laser ablation in liquids,laser-induced plasma
更新于2025-09-23 15:19:57
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Light-induced magnetism in plasmonic gold nanoparticles
摘要： Strategies for the ultrafast optical control of magnetism have been a topic of intense research for several decades because of the potential impact in technologies such as magnetic memory, spintronics and quantum computation, as well as the opportunities for nonlinear optical control and modulation in applications such as optical isolation and non-reciprocity. Here we report experimental quantification of optically induced magnetization in plasmonic gold nanoparticles due to the inverse Faraday effect. The induced magnetic moment is large under typical ultrafast pulse excitation (<1014?W?m?2 peak intensity), with magnetization and demagnetization kinetics that are instantaneous within the subpicosecond time resolution of our study. Our results support a mechanism of coherent transfer of angular momentum from the optical field to the electron gas, and open the door to all-optical sub-wavelength strategies for optical isolation that do not require externally applied magnetic fields.
关键词： ultrafast optical control,quantum computation,inverse Faraday effect,spintronics,magnetic memory,plasmonic gold nanoparticles,light-induced magnetism
更新于2025-09-23 15:19:57
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Photo-response in 2D metal chalcogenide-ferroelectric oxide heterostructure controlled by spontaneous polarization
摘要： The interplay between free and bound charges in two-dimensional (2D) semiconductor/ferroelectric oxide structures is responsible for the unique opto-electrical properties of these structures. In this study, we vertically combined the 2D layered semiconductors MoS2 (n-type) and WSe2 (p-type) with a ferroelectric oxide (PbTiO3) and found that a ferroelectric polarization induced accumulation or depletion in the layered materials. The heterostructures exhibited polarization-dependent charge distribution and pinched hysteresis. We show that polarization at the interface promoted e?cient charge separation of photo-generated carriers in the 2D layers. Optical control of electrical transport was e?ectively achieved in the MoS2 layers. This study potentially opens up new applications for semiconductor/ferroelectric systems in electronic devices.
关键词： opto-electrical properties,optical control,MoS2,2D semiconductor,ferroelectric oxide,PbTiO3,charge separation,WSe2
更新于2025-09-19 17:13:59
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Optical Control in a 3D Flow-Focusing Microfluidic Sorting System
摘要： Separation and sorting of particles (cells, beads, and droplets) is critical in a variety of biomedical applications including early disease diagnostics, therapeutics, cell tracking, and clinical research. Currently, standard microfluidic methods use 2D-chips fabricated using PDMS based soft lithography or embossing/etching materials such as Topas or glass. Often hydrodynamic flow focussing is used to spatially confine the sample flow to particular areas on the chip and so facilitate target species detection; however, 2D systems have limitations when it is necessary to make fine, micrometre scale, adjustments to flow profiles and/or the spatial position of the focused sample stream so as to match up with elements of external bulky equipment such as the laser or light paths of a spectrometer or internal fields used in electrical or acoustic actuation. These limitations can be overcome by using a 3D flow focussing method which can dynamically adjust the flow patterns within the sample chip (Figure 1a, left). For complex systems containing multiple sensor and actuation stages that are best made using hybrid construction of plug-and-play subsystems, a critical aspect of the overall functioning of the system is knowing at what points in time individual particles (e.g. cells, beads) are in the vicinity of different functional parts of the device. For high throughput and high particle densities, this becomes more difficult the larger the chip and the faster the flow. To address this, here we used a strategy of integrating several optical sensors into a hybrid device made from 3D printed and conventional soft lithography PDMS parts (Figure 1a, right), and so provide this timing data. Using these, it has then been possible to develop an automated flow- focusing and sorting microfluidic system with the flexibility and stability required for the sorting and refinement of labelled cells and beads (Figure 1b).
关键词： sorting,hybrid device,optical control,microfluidic,3D flow-focusing
更新于2025-09-12 10:27:22
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Optical control of polarized terahertz waves using dye-doped nematic liquid crystals
摘要： We propose an optically tunable terahertz (THz) polarization converter based on use of a dye-doped nematic liquid crystal (LC). The dye-doped LC exhibits a photothermally-induced nematic-isotropic phase transition under irradiation by a laser beam with a wavelength that lies within the absorption band of the dye. We investigate the transmission spectra and the polarization-conversion properties of the dye-doped LC cell with twisted alignment using THz time-domain spectroscopy. The polarization state of a THz wave transmitted through the proposed dye-doped LC cell can be controlled using the laser beam irradiation based on the photothermal effect. The experimental results also demonstrate that optical control of this dye-doped LC cell offers an advantage in terms of response speed when compared with voltage-based control of LC cells via their electrodes. The dye-doped LC proposed in this study presents the possibility that a variety of LC-based THz elements with optical tunability may be realized.
关键词： terahertz,polarization converter,liquid crystal,optical control,photothermal effect
更新于2025-09-10 09:29:36
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Ultrafast optical control of multiple coherent phonons in silicon carbide using a pulse-shaping technique
摘要： We demonstrated ultrafast optical control of multiple coherent phonons in silicon carbide (SiC) using a pulse-shaping technique combined with sub-10-fs optical pulses and a two-dimensional spatial light modulator. Because our technique produces a pulse train with the desired number of pulses and time intervals, precise manipulation of the amplitudes of the zone-folded optical and acoustic phonon modes could be achieved simultaneously and was well reproduced by a model calculation assuming the two modes are excited independently by each pulse. These results show that our scheme can provide high controllability of multiple phonon modes in SiC.
关键词： pulse-shaping technique,coherent phonons,ultrafast optical control,silicon carbide
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE Research and Applications of Photonics In Defense Conference (RAPID) - Miramar Beach, FL (2018.8.22-2018.8.24)] 2018 IEEE Research and Applications of Photonics In Defense Conference (RAPID) - Integrated Photonics for RF-Photonic Phased-Array Radar System
摘要： We discuss some potential benefits of using integrated RF-photonic devices/circuits in a phased-array-Radar system. A viable and simple solution is proposed for a low-cost, RF-photonic multi-beams beamformer that meets both transmitting and receiving RF-system specifications/requirements. Proof-of-concept experiments and chip-scale integrated-photonics subsystem development will also be discussed.
关键词： Phased array Radar,Fiber optics links and subsystems,Optical control of phased array antenna,Radio frequency photonics,Integrated Photonics
更新于2025-09-04 15:30:14
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[Micro/Nano Technologies] Micro and Nano Fabrication Technology Volume 1 || Micro Milling for Functional Surface
摘要： Micro manufacturing has recently increased in the several ?elds that include optics, electronics, medicine, biotechnology, and communications. Then, drastic progresses have been seen in the micro milling with the technologies in micro/nano-scale measurement, control, and tooling. This chapter describes the micro milling for manufacturing of the functional surfaces, which control material behavior with the surface topography. In the introduction, the current technical status in the functional surfaces is reviewed with the micro fabrication processes, and some issues in the micro milling are described to achieve high qualities of the micro elements and structures on the surfaces. Then, the typical micro milling process is discussed in terms of the operations and the removal process. Regarding material behavior, the effect of crystal grain size and orientation on the removal process becomes relatively large. When the grain size reduces, the dynamic components in the cutting force, burr formation, and affected layer can be controlled in micro cutting. Micro milling is applied to manufacture the functional surfaces with the micro dimples at high machining rates. The micro dimples are machined in milling with the inclined spindle at 45(cid:1). The milling with the cutter axis inclination is also applied to machine the micro dimples on the cylinder surfaces. A mechanistic model is applied to control the dimple shape for the cutting parameters, the feed direction, and the tool geometry. The surfaces with the micro dimples are applied to control the surface functions such as optical re?ection and wettability.
关键词： Surface function,Micro milling,Micro dimple,Wettability,Mechanistic model,Fine grained steel,Optical control
更新于2025-09-04 15:30:14