Tim D. Blasius

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The monitoring of acceleration is essential for a variety of applications ranging from inertial navigation to consumer electronics1,2. Typical accelerometer operation involves the sensitive displacement measurement of a flexibly mounted test mass, which can be realized using capacitive3,4, piezoelectric5, tunnel-current6,7 or optical8–11 methods. Although(More)
We present an integrated optomechanical and electromechanical nanocavity, in which a common mechanical degree of freedom is coupled to an ultrahigh-Q photonic crystal defect cavity and an electrical circuit. The system allows for wide-range, fast electrical tuning of the optical nanocavity resonances, and for electrical control of optical radiation pressure(More)
The monitoring of accelerations is essential for a variety of applications ranging from inertial navigation to consumer electronics [1]. The basic operation principle of an accelerometer is to measure the displacement of a flexibly mounted test mass; sensitive displacement measurement can be realized using capacitive [2, 3], piezo-electric [4],(More)
In previous work on undoped MFe(2)As(2), partial drops in the resistivity indicative of traces of superconductivity have been observed for some samples with M =  Ba (T(c)∼20 K, up to 25% drop in ρ) and M =  Ca (T(c)∼10 K, up to 45% drop in ρ). A complete drop in the resistivity to ρ = 0, along with a finite fraction of Meissner flux expulsion, has been(More)
Optical measurement of the motion of a 940 kHz mechanical resonance of a silicon nitride nanostring resonator is demonstrated with a read out noise imprecision reaching 37 dB below that of the resonator’s zero-point fluctuations. Via intensity modulation of the optical probe laser, radiation pressure feedback is used to cool and damp the mechanical mode(More)
The oscillator susceptibility χ(ω) given in the main text follows from the differential equation of the harmonic oscillator: m ¨ x + mγ ˙ x + mω 2 m x = F appl. (S1) Transforming to Fourier space, this reads −ω 2 x + iωγx + ω 2 m x = F appl (ω) m. (S2) With F appl (ω)/m = a appl , this yields the accelerometer response x(ω) = χ(ω)a appl (ω) = 1 ω 2 m − ω 2(More)
UNLABELLED Ricin is a potential bioterrisiom agent. There is a critical need for a method that can rapidly and simply detect ricin and other bioterrisiom agents in complex food matrices such as milk. In this study, we demonstrated a rapid method that combined immunomagnetic separation (IMS) and surface-enhanced Raman spectroscopy (SERS) to detect ricin in(More)
While the importance of dusty asymptotic giant branch (AGB) stars to galactic chemical enrichment is widely recognized, a sophisticated understanding of the dust formation and wind-driving mechanisms has proven elusive due in part to the difficulty in spatially resolving the dust-formation regions themselves. We have observed 20 dust-enshrouded AGB stars as(More)
Superconducting crystals of the compound BaFe 2 As 2 , which is a member of the recently discovered class of " 122 structure " iron-arsenic superconductors, MFe 2 As 2 , were made. Our group was the first to observe a complete superconducting resistive transition in the undoped compound BaFe 2 As 2 (). The resistive transition was measured before and after(More)
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