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Unification of plasmonics and all-dielectric nanophotonics in one system offers advantages in terms of light manipulation at nanoscale. In this work we demonstrate a novel type of asymmetrical hybrid nanostructures fabricated via combination of conventional lithographical methods with fs laser reshaping at nanoscale. The method of such type structures fabrication makes possible accurate engineering...
Photovoltaic (PV) cells are important devices that can be used to convert photons into electrical energy. However, the cost of current PV devices needs to be significantly reduced and their efficiencies need to be substantially enhanced to enable large scale implementation of PV cells as sources of clean electrical energy. Surface plasmon polaritrons (SPP) in metallic nanostructures in close proximity...
Low-cost optical interconnects are playing an important role in sustaining the exponential growth in data center demand and to support the future internet-of-things cloud infrastructure. These chip-scale optical transceiver systems are integrated using two-chip bonding solution of CMOS electronic die with a silicon photonic die. In this work, modeling of the critical bond-wire is performed with electromagnetic...
Rotating grinding is the most commonly used technique in silicon wafer thinning, while it will induce edge chipping as wafer thickness decrease. This will lead to wafer breakage, and thus resulting in cost waste. This study investigates edge chipping of silicon wafers in rotating grinding. The study correlates edge chipping with grinding process parameters, such as wheel rotation speed, wafer rotation...
A sealed Otto chip device has recently been demonstrated as a potential alternative for the traditional Kretschmann based configuration for the development of surface plasmon resonance - SPR - sensors. We have fabricated an open Otto chip structure on silicon and have characterized the SPR effect at a wavelength of 975.1 nm. In this paper we report on an open Otto chip pressure transducer.
Self-propagating exothermic reaction of Al/Ni multilayer film has been developed as a heat source with small heat region and high reaction rate in the field of bonding. In this paper, using this kind of localized and rapid heat source, solder preforms with different melting point such as SAC305 (217°C), Au80Sn20 (278°C) and A88Ge12 (356°C) have been applied to achieve the Si/Si bonding includes stacked...
Optical nano-antennas have been used for many applications in many contexts [1]. The possibilities to control both field enhancement and spatial distribution, to tune the resonant wavelength, and to design the local phase constitute unique assets that explain the popularity of plasmonic nano-antenna. In this work, we propose to use plasmonic nano-antennas integrated in a silicon photonic integrated...
Using atomically flat gold surfaces, we observe long- and short-range surfaces plasmons on unstructured as well as patterned surfaces. Time-resolved two-photon photoemission microscopy reveals the rich dynamics of plasmon propagation, including spin-orbit coupling in surface plasmons with orbital angular momentum up to l = 20.
Nano-textured surfaces on Si, Cu, and polystyrene (PS) substrates with feature sizes down to 10–20nm fabricated over large areas by simple maskless plasma and chemical etching (Si and Cu, respectively) or thermally induced PS shrinking are compared for the surface enhanced Raman scattering (SERS) action.
Shaping the flow of light based on abrupt phase discontinuities operation in high order modes is investigated. As a proof-of-concept, we design two types of super cells consisting of V-shaped antennas with phase shifts covering 2*2π and 3*2π. The simulations show that the linear gradient phased metasurfaces using the new designed super cells can exhibit exceptional abilities for light-steering functioned...
Waste heat is a widely available but little used source of power. Converting a thermal gradient into electricity is conventionally done using the Seebeck effect, but devices that use this effect are naturally inefficient. An alternate approach uses microelectromechanical systems (MEMS) to generate movement and time-varying temperature from a constant temperature gradient. Ferroelectric materials can...
A high photo-induced effective minority carrier lifetime τeff of crystalline silicon was achieved by simple heat treatment in liquid water. τeff was 2.8×10−3 s for 15-Ωcm n-type crystalline silicon heat treated in liquid water at 120°C for 1.5 h. The τeff for the sample treated at 90°C increased from 1.0×10−4 s (just after the treatment) to 1.7×10−3 s by keeping the sample in the air atmosphere for...
This research describes the p-type nanostalactites (p-type NS) with high photothermal conversion capability has been demonstrated by rapid INC process without extra heat treatment. In optical property, p-type NS has ultralow reflectance below 5 % and high light absorption due to rough structures in the broadband wavelength (350 nm–1100 nm). It looks like a black body. Silicon, an indirect band material,...
Here, we propose a novel type of hybrid oligomers consisting of asymmetric metal-dielectric nan-odimers which have magnetic Fano resonances in the visible range. We numerically show that the profile of this Fano resonance and its position can be changed by precise femtosecond laser reshaping of metal nanoparticles in the nanodimers.
This paper presents a continuation of an investigation into the behavior of lead magnesium niobate-lead titanate, Pb(Mg0.33Nb0.67)0.65Ti0.35O3) (PMNT) thin film at high frequency through electromagnetic (EM) simulation. The purpose of this paper is to improve the electrical characteristics. The electrical characteristics were analyzed on CPW built on PMNT thin films. In this study, we focus on the...
In summary, we demonstrated WSe2 FETs contacted with thin metallic WTe2, at channel lengths down to 90 nm and current saturation up to 60 μA/μm. A temperature-dependent study suggests the presence of an intrinsic vdWg at the 2D-2D contact. Thus, ultra-thin WTe2 could be preferred to graphene as a contact depinning layer. This work was supported in part by the AFOSR, NSF-EFRI, and Stanford SystemX.
Analyzing the modal content of resonant nanostructures using optical methods often becomes a sophisticated problem because of hidden dark resonances, which are uncoupled with far-field modes. The common methods of dark modes spectroscopy base on electron beam systems, such as cathodo-luminescence and, thus, are not very convenient in use. We suggest utilizing Raman spectroscopy to reveal the full...
Fabrication of metal/semiconductor (“hybrid”) nanoparticles is still a challenge due to the absence of methods of a metal core coating by crystalline semiconductor shell. We propose a novel principle of formation of a core-shell nanoparticle made of liquid silicon and gold droplets. Molecular dynamics simulations of the droplets behavior demonstrates that the core-shell structure with a gold core...
Through silicon vias are key components in 2.5D and 3D microelectronic packaging. Deep silicon etching is the critical step in fabrications of TSVs. Uniform metal-assisted chemical etching (MaCE) has been considered as a promising method to the conventional deep reaction ion etching for deep silicon etching. In this paper, we demonstrated that the uniform MaCE method is capable of fabricating vertical...
In this study, rechargeable thin solid-state lithium batteries on polyimide substrate were developed and characterized. Excellent performances were noted in terms of cycle life (0.05% per cycle at high current discharge) and flexibility (up to 300 cycles at harsh bending radius 0.65 cm). In addition, multiple flexible cells can be readily connected in series or parallel arrangements to match a wide...
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