Oren Suchoi - Academia.edu (original) (raw)

Papers by Oren Suchoi

arXiv (Cornell University), Dec 4, 2013

We present a study of the controllable nonlinear dynamics of a micromechanical beam coupled to a ... more We present a study of the controllable nonlinear dynamics of a micromechanical beam coupled to a dc-SQUID (superconducting quantum interference device). The coupling between these systems places the modes of the beam in a highly nonlinear potential, whose shape can be altered by varying the bias current and applied flux of the SQUID. We detect the position of the beam by placing it in an optical cavity, which frees the SQUID to be used solely for actuation. This enables us to probe the previously unexplored full parameter space of this device. We measure the frequency response of the beam and find that it displays a Duffing oscillator behavior which is periodic in the applied magnetic flux. To account for this, we develop a model based on the standard theory for SQUID dynamics. In addition, with the aim of understanding if the device can reach nonlinearity at the single phonon level, we use this model to show that the responsivity of the current circulating in the SQUID to the position of the beam can become divergent, with its magnitude limited only by noise. This suggests a direction for the generation of macroscopically distinguishable superposition states of the beam.

We present a new approach to the induction detection of electron spin resonance (ESR) signals exp... more We present a new approach to the induction detection of electron spin resonance (ESR) signals exploiting the nonlinear properties of a superconducting resonator. Our experiments employ a yttrium barium copper oxide (YBCO) superconducting stripline microwave (MW) resonator integrated with a microbridge. A strong nonlinear response of the resonator is thermally activated in the microbridge when exceeding a threshold in the injected MW power. The responsivity factor characterizing the ESR-induced change in the system’s output signal is about 100 times larger when operating the resonator near the instability threshold, compared to the value obtained in the linear regime of operation. Preliminary experimental results, together with a theoretical model of this phenomenon are presented. Under appropriate conditions nonlinear induction detection of ESR can potentially improve upon the current capabilities of conventional linear induction detection ESR.

We study a mechanical resonator made of aluminum near the normal to super conductivity phase tran... more We study a mechanical resonator made of aluminum near the normal to super conductivity phase transition. A sharp drop in the rate of mechanical damping is observed below the critical temperature. The experimental results are compared with predictions based on the Bardeen Cooper Schrieffer theory of superconductivity and a fair agreement is obtained. Mechanical resonators having low damping rate are widely employed for sensing and timing applications [1]. At sufficiently low temperatures such devices may allow the experimental exploration of the crossover from classical to quantum mechanics [2–8]. Commonly, the observation of non-classical effects in such experiments is possible only when the damping rate [9] of the mechanical resonator is sufficiently low. Mechanical resonators made of superconductors are widely employed in such lowtemperature experiments. In this study we experimentally investigate the effect of superconductivity on the damping rate of a mechanical resonator made o...

EPL (Europhysics Letters), 2017

EPL (Europhysics Letters), 2016

We experimentally study an optomechanical cavity that is formed between a mechanical resonator, w... more We experimentally study an optomechanical cavity that is formed between a mechanical resonator, which serves as a movable mirror, and a stationary on-fiber dielectric mirror. A significant change in the behavior of the system is observed when the distance between the fiber's tip and the mechanical resonator is made smaller than about 1 µm. The observed effects are attributed to the combined influence of Casimir force, Coulomb interaction due to trapped charges, and optomechanical coupling. The comparison between experimental results and theory yields a partial agreement.

Applied Physics Letters, 2012

We present a new approach to the induction detection of electron spin resonance (ESR) signals exp... more We present a new approach to the induction detection of electron spin resonance (ESR) signals exploiting the nonlinear properties of a superconducting resonator. Our experiments employ a yttrium barium copper oxide (YBCO) superconducting stripline microwave (MW) resonator integrated with a microbridge. A strong nonlinear response of the resonator is thermally activated in the microbridge when exceeding a threshold in the injected MW power. The responsivity factor characterizing the ESR-induced change in the system's output signal is about 100 times larger when operating the resonator near the instability threshold, compared to the value obtained in the linear regime of operation. Preliminary experimental results, together with a theoretical model of this phenomenon are presented. Under appropriate conditions nonlinear induction detection of ESR can potentially improve upon the current capabilities of conventional linear induction detection ESR.

EPL (Europhysics Letters), 2009

We utilize a superconducting stripline resonator containing a dc-SQUID as a strong intermodulatio... more We utilize a superconducting stripline resonator containing a dc-SQUID as a strong intermodulation amplifier exhibiting a signal gain of 25 dB and a phase modulation of 30 dB. Studying the system response in the time domain near the intermodulation amplification threshold reveals a unique noise-induced spikes behavior. We account for this response qualitatively via solving numerically the equations of motion for the integrated system. Furthermore, employing this device as a parametric amplifier yields a gain of 38 dB in the generated side-band signal.

Highly reproducible Nb/Al(AlOx)/Nb Josephson junction based direct current superconducting quantu... more Highly reproducible Nb/Al(AlOx)/Nb Josephson junction based direct current superconducting quantum interference devices (DC SQUID) were fabricated by three dimensional etching using focused ion beam. Hysteretic and non-hysteretic DC SQUID with critical current ranging from 25 to 1100 µA were fabricated by varying the Al barrier and oxygen exposure time. The fabricated DC SQUIDs have shown periodic flux dependence with high modulation factor reaching a value of 92% at 4.2 K.

Phys Rev B, 2011

We study the metastable response of a highly hysteretic dc superconducting quantum interference d... more We study the metastable response of a highly hysteretic dc superconducting quantum interference device (SQUID) made of a niobium loop interrupted by two nanobridges. We excite the SQUID with an alternating current and with direct magnetic flux, and find different stability zones forming diamond-like structures in the measured voltage across the SQUID. When such a SQUID is embedded in a transmission line resonator, similar diamond structures are observed in the reflection pattern of the resonator. We calculate the dc-SQUID stability diagram in the plane of the exciting control parameters, both analytically and numerically. In addition, we obtain numerical simulations of the SQUID equations of motion, taking into account temperature variations and nonsinusoidal current-phase relation of the nanobridges. Good agreement is found between experimental and theoretical results.

Eprint Arxiv 0907 3267, Jul 19, 2009

We study self-sustained oscillations (SO) in a Nb superconducting stripline resonators (SSR) inte... more We study self-sustained oscillations (SO) in a Nb superconducting stripline resonators (SSR) integrated with a DC superconducting quantum interface devices (SQUID). We find that both the power threshold where these oscillations start and the oscillations frequency are periodic in the applied magnetic flux threading the SQUID loop. A theoretical model which attributes the SO to a thermal instability in the DC-SQUID yields a good agreement with the experimental results. This flux dependant nonlinearity may be used for quantum state reading of a qubit-SSR integrated device.

We study voltage response of nano-bridge based DC-SQUID fabricated on a Si3 N4 membrane. Such a c... more We study voltage response of nano-bridge based DC-SQUID fabricated on a Si3 N4 membrane. Such a configuration may help in reducing 1/f noise, which originates from substrate fluctuating defects. We find that the poor thermal coupling between the DC-SQUID and the substrate leads to strong hysteretic response of the SQUID, even though it is biased by an alternating current. In addition, when the DC-SQUID is biased near a threshold of spontaneous oscillations, the measured voltage has an intermittent pattern, which depends on the applied magnetic flux through the SQUID.

2015 International Conference on Optical MEMS and Nanophotonics (OMN), 2015

Physical Review B

We study a superconducting stripline resonator ͑SSR͒ made of niobium, which is integrated with a ... more We study a superconducting stripline resonator ͑SSR͒ made of niobium, which is integrated with a superconducting interference device ͑SQUID͒. The large nonlinear inductance of the SQUID gives rise to a strong Kerr nonlinearity in the response of the SSR, which in turn results in strong coupling between different modes of the SSR. We experimentally demonstrate that such intermode coupling gives rise to dephasing of microwave photons. The dephasing rate depends periodically on the external magnetic flux applied to the SQUID, where the largest rate is obtained at half integer values ͑in units of the flux quantum͒. To account for our result we compare our findings with theory and find good agreement.

Physical Review E, 2015

We study self-excited oscillations (SEO) in an on-fiber optomechanical cavity. Synchronization is... more We study self-excited oscillations (SEO) in an on-fiber optomechanical cavity. Synchronization is observed when the optical power that is injected into the cavity is periodically modulated. A theoretical analysis based on the Fokker-Planck equation evaluates the expected phase space distribution (PSD) of the self-oscillating mechanical resonator. A tomography technique is employed for extracting PSD from the measured reflected optical power. Time-resolved state tomography measurements are performed to study phase diffusion and phase locking of the SEO. The detuning region inside which synchronization occurs is experimentally determined and the results are compared with the theoretical prediction.

Journal of Applied Physics, 2015

We report on the fabrication and measurement of a micromechanical beam embedded in a direct curre... more We report on the fabrication and measurement of a micromechanical beam embedded in a direct current superconducting quantum interference device (dc-SQUID) and placed in an externally applied magnetic field. The coupling to the SQUID alters the effective potential of the mechanical modes of the beam, in a manner similar to the optical spring effect. This effective potential induces on the modes a strong frequency shift and Duffing type nonlinearity, both of which can be tuned by controlling the applied flux and bias current of the SQUID. A semi-numerical theoretical analysis of the effective potential is found to be in partial agreement with measured results. When biasing the SQUID slightly above the transition to the resistive state and when the applied flux is tuned to half integer value in units of flux quantum, the effective potential becomes divergent. We show this by obtaining an analytical expression for the circulating current of the SQUID at this operating regime.

Physical Review B, 2011

We study the metastable response of a highly hysteretic DC-SQUID made of a Niobium loop interrupt... more We study the metastable response of a highly hysteretic DC-SQUID made of a Niobium loop interrupted by two nano-bridges. We excite the SQUID with an alternating current and with direct magnetic flux, and find different stability zones forming diamond-like structures in the measured voltage across the SQUID. When such a SQUID is embedded in a transmission line resonator similar diamond structures are observed in the reflection pattern of the resonator. We have calculated the DC-SQUID stability diagram in the plane of the exciting control parameters, both analytically and numerically. In addition, we have obtained numerical simulations of the SQUID equations of motion, taking into account temperature variations and non-sinusoidal current-phase relation of the nano-bridges. Good agreement is found between experimental and theoretical results.

arXiv (Cornell University), Dec 4, 2013

EPL (Europhysics Letters), 2017

EPL (Europhysics Letters), 2016

Applied Physics Letters, 2012

We present a new approach to the induction detection of electron spin resonance (ESR) signals exp... more We present a new approach to the induction detection of electron spin resonance (ESR) signals exploiting the nonlinear properties of a superconducting resonator. Our experiments employ a yttrium barium copper oxide (YBCO) superconducting stripline microwave (MW) resonator integrated with a microbridge. A strong nonlinear response of the resonator is thermally activated in the microbridge when exceeding a threshold in the injected MW power. The responsivity factor characterizing the ESR-induced change in the system's output signal is about 100 times larger when operating the resonator near the instability threshold, compared to the value obtained in the linear regime of operation. Preliminary experimental results, together with a theoretical model of this phenomenon are presented. Under appropriate conditions nonlinear induction detection of ESR can potentially improve upon the current capabilities of conventional linear induction detection ESR.

EPL (Europhysics Letters), 2009

Phys Rev B, 2011

Eprint Arxiv 0907 3267, Jul 19, 2009

2015 International Conference on Optical MEMS and Nanophotonics (OMN), 2015

Physical Review B

Physical Review E, 2015

Journal of Applied Physics, 2015

Physical Review B, 2011