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Mechanically-controllable strong 2D ferroelectricity and optical properties of semiconducting BiN monolayer
摘要： Structural, electronic, ferroelectric, and optical properties of two-dimensional (2D) BiN monolayer material with phosphorene-like structure are studied in terms of the density functional theory and modern Berry phase method of ferroelectric calculation. Both phonon spectra, molecular dynamics simulations, and total energy comparison indicate that the BiN monolayer is a stable 2D ferroelectric with polarization as large as 580 pC/m, with ferroelectric polarization being sustainable up to 500 K. Further study shows that the polarization in the BiN monolayer can be easily switched from [100] to [010] direction over the bridging saddle phase by applying a tensile [010] stress of 2.54 N/m or compressive [100] stress of -1.18 N/m. This phase transition makes its lattice constants vary in a large range compared to other non-ferroelectric 2D materials. Moreover, through applying uniaxial tensile stress parallel to the polarization, one can fix the polarization and change the semiconductor energy gap, from direct to indirect one. The optical properties feature a very strong anisotropy in reflectivity below the photon energy of 4 eV. All these significant ferroelectric, mechanical, electronic, and optical properties make us believe that the 2D BiN monolayer can be used to make stretchable electronic devices and optical applications.
关键词： 2D material,optical property,monolayer,mechanical manipulation,2D ferroelectricity,2D semiconductor
更新于2025-09-23 15:23:52
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[IEEE 2018 International Conference on Information and Communication Technology Robotics (ICT-ROBOT) - Busan (2018.9.6-2018.9.8)] 2018 International Conference on Information and Communication Technology Robotics (ICT-ROBOT) - Hidden-Surface Processing for Interaction of Hand and Virtual Objects Using Leap Motion Controller
摘要： Recently augmented reality (AR) technology has attracted a lot of attention and is studied. Furthermore, it is applied to the interaction technology between human and virtual objects. In AR interaction technology, it is necessary for the user to be able to manipulate virtual objects intuitively, so it is required to manipulate the objects by their hand. However, in AR technology, since the 3-dimensional model is superimposed on the image of the real space afterwards, it is always displayed on the front side than the hand (occlusion problem). It is an unnatural scene in some cases. In this study, we utilized Leap Motion Controller to acquire the depth data of the user’s hand and fingers. We performed hidden-surface processing considering the depth and the color of the hand and fingers. Thus we enabled appropriate hidden-surface processing in the area of the user’s hand and fingers.
关键词： virtual objects,augmented reality,intuitive manipulation,occlusion problem
更新于2025-09-23 15:23:52
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Mechanism of field-induced manipulation of Cu-phthalocyanines on a Bi surface using scanning tunneling microscope
摘要： We have revisited our hypothesis [K. Nagaoka et al., Jpn. J. Appl. Phys. 57 (2018) 020301] regarding the control of the motion and assembly of copper phthalocyanine (CuPc) molecules on a Bi(001) surface using a scanning tunneling microscope (STM) tip. The proposal that the observed diffusion and condensation are not due to the adsorption/desorption of molecules via the tip by applying a bias voltage was investigated for field-induced manipulation. Our experiments show that CuPc cannot move across steps or condense on different terraces on the Bi(001) surface. When confined to a nano-scale region, the CuPc molecules assemble into ordered single-layer islands. The island position can be manipulated using the STM tip, with an almost constant number of condensed molecules remaining inside the terrace. These results allowed us to rule out the possibility of picking-up and depositing molecules by the STM tip.
关键词： STM,phthalocyanine,self-assembly,field-induced manipulation,bismuth,surface science
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO) - Hangzhou, China (2018.8.13-2018.8.17)] 2018 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO) - Bottom up Nano-integration Technique for the Fabrication of Novel Superconducting Quantum Interference Devices Based on Granular Superconducting Diamond
摘要： The report is focused on the fabrication and characterization of nano-necklaces created from individual nanostructures namely heavily boron-doped superconducting nano-diamond grains and BIISCO whiskers. The production of nanostructures from individual nano-diamonds is done using 3D mechanical nano-manipulation and nano-assembling based on new generation shape memory alloy composite nanotweezers. Quantum transport of such nano-necklaces will be probed in order to study the confinement effects on superconductivity and other related quantum effects. This bottom-up nano-integration technique thus demonstrates a niche fabrication route for the realization of novel complex nanostructured quantum rings which may be of use for quantum information technologies.
关键词： nanodiamonds,bottom-up paradigm,carbon based nanomaterials,nanogripper,shape memory effect,nano-manipulation,superconductivity
更新于2025-09-23 15:23:52
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High-bandwidth 3D Multi-Trap Actuation Technique for 6-DoF Real-Time Control of Optical Robots
摘要： Optical robots are micro-scale structures actuated using laser trapping techniques. However, the lack of robust and real-time 3D actuation techniques reduces most applications to planar space. We present here a new approach to generate and control several optical traps synchronously in 3D with low latency and high bandwidth (up to 200 Hz). This time-shared technique uses only mirrors, hence is aberration-free. Simultaneous traps are used to actuate optical robots and provide 6-DoF telemanipulation. Experiments demonstrate the flexibility and dexterity of the implemented user control, paving the way to novel applications in micro-robotics and biology.
关键词： Optical Manipulation,Biological Cell Manipulation,Micro/Nano Robots,Telerobotics and Teleoperation
更新于2025-09-23 15:22:29
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Investigation of a low cost tapered plastic fiber optic biosensor based on manipulation of colloidal gold nanoparticles
摘要： We demonstrate a low cost Tapered Fiber Optic Biosensor (TFOBS) based on manipulation of colloidal gold nanoparticle in the evanescent field of tapered fiber. The sensor consists of a biconical tapered plastic optical fiber with colloidal gold nanoparticles coated on the tapered region. The strength of evanescent field absorption as a function of gold nanoparticle size is evaluated using Finite Difference Time Domain simulation. Simulation results suggest that in order to achieve maximum absorption in visible range of wavelength, the size of the gold nanoparticle should be in the range 3-4 nm. Gold nanoparticle of desired size is then synthesized and coated on the tapered region to fabricate a TFOBS. It is found experimentally that coating of gold nanoparticles enhances the fraction of light coming out to the cladding surface. This is explained as a consequence of local surface plasmonic resonance. The TFOBS is then tested for its sensing application to detect Bovine Serum Albumin. Level of detection of the proposed sensor is calculated and is found as 0.326gm/dL.As normal albumin level in healthy human blood serum is between 3.5 to 5.5gm/dL, the proposed TFOBS can be used as a low cost accurate albumin sensor.
关键词： Tapered Fiber Optic Sensor,Local Surface Plasmon Resonance,Manipulation of nanoparticle
更新于2025-09-23 15:22:29
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Multisegmented Metallic Nanorods: Sub-10 nm Growth, Nanoscale Manipulation, and Subwavelength Imaging
摘要： Multisegmented metallic nanorods (MS-M-NRs) have attracted increasing attention thanks to their integrated structures and complex functions. The integration of nanoscale segments in 1D enables maximum exposure of each segment and enhanced interaction between adjacent segments. Such structural integration will induce functional complexity in the nanorods, leading to superior properties for the individual components. Herein, recent progress on the development of MS-M-NRs is reviewed. Their precise fabrication, nanoscale manipulation, and subwavelength imaging, as well as simultaneous manipulation and imaging are discussed, respectively. Specifically, precise fabrication of MS-M-NRs focuses on porous anodic alumina (PAA) templated electrodeposition, which enables sub-10 nm growth of the segments and their interfaces/fronts. Nanoscale manipulation of MS-M-NRs introduces the fundamental methods that are employed for delicate movement control on the nanorods through internal or external stimulations. Subwavelength imaging of MS-M-NRs highlights the achievements on identification and location of constituent nanoscale segments/gaps based on their differences and interactions. Simultaneous manipulation and imaging of MS-M-NRs addresses the significance and potential applications of the nanorods with magnetic–plasmonic dual modulation. The development of MS-M-NRs will greatly contribute to materials science and nanoscience/nanotechnology.
关键词： metallic nanorods,porous anodic alumina (PAA),electrodeposition,imaging,manipulation
更新于2025-09-23 15:22:29
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A transformation elasticity based device for wavefront manipulation
摘要： The authors propose a metamaterial plate made of gradient refractive index phononic crystals for manipulation of the wavefront of propagating waves. A square unit cell with through holes is considered. Guidance on the design of the hole pattern and the choice of materials is obtained with the aid of transformation elasticity principles. Manipulation of a plane wavefront into a cylindrical wavefront is first observed through Finite Element simulations at low frequency (100 kHz), and then practically demonstrated through experiments. Wave propagation with and without the holey region is compared and possible applications at higher frequencies are discussed.
关键词： Metamaterial Plate,Transformation Elasticity,GRIN PC,Wave Manipulation,Guided Waves
更新于2025-09-23 15:22:29
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Low-cost light manipulation coatings for polymer solar cell photocurrent increase under various incident angles
摘要： We fabricate self-assembled templates to produce textured polydimethylsiloxane (PDMS) with quasi-random dimension distributions which are employed as light manipulation coatings in polymer solar cells (PSCs). When deposited at the PSC glass/air interface, PDMS films with microdome-like structures enhance the short-circuit current density (Jsc) by 7.9% through combined anti-reflective and scattering effects. The PSC power conversion efficiency can thus be improved from 6.75% to 7.28% and a maximum Jsc increase of 21% is observed for incident light tilted by 30 degrees. We compare structures with different diameter dispersities and confirm that quasi-randomness in textured coatings can increase their light scattering ability.
关键词： Nanofabrication,self-assembly,light manipulation,polymer solar cells
更新于2025-09-23 15:22:29
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Tailoring Bond Topologies in Open-Shell Graphene Nanostructures
摘要： Polycyclic aromatic hydrocarbons exhibit a rich spectrum of physico-chemical properties depending on the size, and more critically, on the edge and bond topologies. Among them, open-shell systems – molecules hosting unpaired electron densities – represent an important class of materials for organic electronic, spintronic and optoelectronic devices, but remain challenging to synthesize in solution. We report the on-surface synthesis and scanning tunneling microscopy- and spectroscopy-based study of two ultra-low-gap open-shell molecules, namely peri-tetracene, a benzenoid graphene fragment with zigzag edge topology, and dibenzo[a,m]dicyclohepta[bcde,nopq]rubicene, a non-benzenoid non-alternant structural isomer of peri-tetracene with two embedded azulene units. Our results provide an understanding of the ramifications of altered bond topologies at the single-molecule scale, with the prospect of designing functionalities in carbon-based nanostructures via engineering of bond topology.
关键词： open-shell polycyclic aromatic hydrocarbons,atom manipulation,non-alternant polycyclic aromatic hydrocarbons,scanning tunneling microscopy,density functional theory,scanning tunneling spectroscopy
更新于2025-09-23 15:21:01