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Electronic interfaces to the nervous system are increasingly important for experimental neuroscience as well as medical diagnostics and therapies. Existing neural interfaces are limited, however, by the use of passive recording and stimulation devices that are connected to active electronics on separate physical platforms through large amounts of passive wiring. This manuscript proposes a new approach...
In this work we present the design, fabrication and characterization of a silicon photonics Mach-Zehnder modulator (MZM) with resonant electrode. The device shows an enhanced modulation response in the 20GHz frequency range compared to a standard traveling-wave MZM.
Cu surface oxide prevents Cu-Cu low temperature bonding and raises contact resistance on bonding interface. Therefore, in this study, formic acid gas was used to treat Cu surface oxide for low temperature bonding and decreasing contact resistance. A pair of new electrode samples were designed and fabricated for contact resistance measurement. It includes many small electrodes located on the whole...
We present a unique lateral bulk resonance mode with a lateral strain profile that resembles a shirt button that we transduce piezoelectrically in a MEMS disk resonator. This button-like (BL) mode offers the 3-fold benefits of (1) intrinsic feedthrough cancellation using fully-differential transduction, (2) strong piezoelectric coupling from the associated strain profile, and (3) higher quality (Q)...
We have investigated the physical mechanisms of explosive breakdown of a graphene/SiO2/Si (GOS) structure under high-field pulsed drive: both p-Si and n-Si GOS structures under inversion bias. The breakdown damages are found to significantly differ between the two structures: highly localized, circular, protruding/deep melt explosion of Si for the n-Si GOS case; shallow, irregular, laterally-propagating...
Identifying the technology trends, key patents to be aware of, the key players active in the field, the product areas that are heavily patented or scarcely addressed, and the focus of a company's competitors represent crucial aspects of developing a successful strategic plan, determining a company's freedom to make and sell their product, and focusing future research & product development efforts...
We demonstrate a single-drive parallel-push-pull silicon optical modulator. When optically biased at the quadrature point, the device has an extinction ratio of 3.1 dB at the speed of 20 Gbps and under the driving voltage of 1.8 Vpp.
This paper reports on a minimal growth factor and clinical translation friendly methodology using micromachined penetrating nanoelectrodes to differentiate Adipose Derived Stem Cells (ADSCs) into neuronal lineage. Electrical stimulus is delivered via penetrating nanoelectrodes to differentiate ADSCs toward neuronal lineage with minimal use of conventional growth factors, genetic manipulators, cytokines...
The preponderance of research into flying microrobots has focused on biomimetic flight mechanisms. In this work, we demonstrate an insect-scale robot capable of vertical takeoff using electrohydrodynamic thrust, a mechanism with no natural analogue. The 10mg, 1.8cm by 1.8cm “ionocraft” operates at about 2400 volts and has a thrust to weight ratio of approximately 10. Feasibility of using individually...
Silicon-plasmonic photodetection based on internal photoemission exploits the intrinsic absorption in plasmonic waveguides at metal-dielectric interfaces. For this purpose we designed an asymmetric metal-semiconductor-metal waveguide with a width of 75 nm. Our plasmonic internal photoemission detector (PIPED) shows a rec-ord-high photocurrent sensitivity of up to S = 0.12 A / W for light at a wavelength...
This paper presents a preliminary empirical characterization of modulated electric signal waveforms used to manipulate particles in colloids and deposit them on a substrate. Particle mobility enhancement is demonstrated by the combination of AC and DC electric signals inside of an adapted electrolytic cell, which acts as a lower order model for a micro-additive manufacturing process, currently under...
Flexible 2.5 cm × 2.5 cm PZT thin films on polyimide substrate were successfully obtained through a release and transfer process developed in this work. The released films not only functioned, but had superior properties compared to films grown on silicon wafers. This approach to flexible piezoelectric devices provides opportunities for sensors, transducers, and energy harvesters.
For resistive random access memory (RRAM) applications, selector devices play an important role to ensure that an individual memory element can be properly addressed through reading and writing while at the same time the information stored in the other cells of the same array does not get perturbed and power does not get wasted by undesirable leakage through unselected cells. An ideal selector device...
The objective of the project is to develop a model for the capacitive ultrasonic transducer described in the Ladabaum et al., [1] paper. The main element of the transducer is a metalized silicon nitride membrane suspended on a rigid support above a heavily doped silicon bulk. The cavity under the membrane is vacuumed. When a voltage is applied between the metalized membrane and the bulk, the Coulomb...
We developed a microelectromechanical system to controllably fracture overhanging silicon micro-beams, in an attempt to fabricate conformal electrode pairs. Controlled fracture by applying tensile force in the <111> crystal direction produces flat, and very low roughness fracture surfaces, which are then utilized as conformal electrodes for inducing large area tunneling emission of electrons...
An input/output characteristics of the inverter composed of the DNA/Si-MOSFET and the parasitic capacity was studied. The DNA was bridged between the Si electrodes those serve as the source and drain with the 120nm-gap-length. At VDD=0V and VDD=3V, the output characteristic was almost the same. The reason of this phenomenon is that the space charge layer of the DNA/Si-MOSFET changes due to the charge...
Critical values of mobile charge in intergate thermal oxide of the transfer transistor of photodetector's matrix and parameters of heterogeneous of polysilicon gate are calculated as part of ionic relaxation model of transport of alkali metals' mobile charges Na+ and K+. The model takes into the account the influence of the mobile charges' the electric field of electrets on heterogeneity on the surface...
In this paper, we present a scalable physics-based model that accurately predicts the steady-state high-frequency behavior of memristive RF switches. This model is, to the best of our knowledge, the first lumped RF memristor model that includes device parasitics obtained from physical measurements reported in the literature. Furthermore, we propose two topologies (series and shunt) for non-volatile...
Although the potential for intracortical implanted microelectrodes has been demonstrated, successful clinical translation has been hindered by their inability to function over clinically relevant time-points (years to decades). Failure of implanted microelectrode arrays (MEA's) has been highly correlated with the foreign body response which progressively encapsulates the MEA's in a glial sheath, isolating...
There are strong needs for flexible and stretchable devices for the seamless integration with soft and curvilinear human skin or irregularly textured clothes. However, the mechanical mismatch between the conventional rigid electronics and the soft human body results in many problems. Since nanoscale materials can provide mechanical and electrical versatility, various nanomaterials have rapidly established...
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