Michele Zaffalon | University of Groningen (original) (raw)

Address: Maur, Zurich, Switzerland

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Papers by Michele Zaffalon

Research paper thumbnail of Spin Accumulation in Ferromagnetic/Normal and Ferromagnetic/Superconducting Systems

Research paper thumbnail of Superconducting Graphene Nanoelectronic Devices

Graphene, a single atom-thick sheet of graphite discovered in recent years, has attracted tremend... more Graphene, a single atom-thick sheet of graphite discovered in recent years, has attracted tremendous attention due to its exotic electronic properties. At low energy, its gapless linear band structure results in transport properties described by the Dirac equation, making it an ideal system for the study of exotic quantum phenomena and other new physics. Graphene may also exhibit many novel

Research paper thumbnail of Superconducting Graphene Nanoelectronic Devices

Graphene, a single atom-thick sheet of graphite discovered in recent years, has attracted tremend... more Graphene, a single atom-thick sheet of graphite discovered in recent years, has attracted tremendous attention due to its exotic electronic properties. At low energy, its gapless linear band structure results in transport properties described by the Dirac equation, making it an ideal system for the study of exotic quantum phenomena and other new physics. Graphene may also exhibit many novel

Research paper thumbnail of Spin Accumulation in Ferromagnetic/Normal and Ferromagnetic/Superconducting Systems

Research paper thumbnail of Frequency discriminators for the characterization of narrow-spectrum heterodyne beat signals: Application to the measurement of a sub-hertz carrier-envelope-offset beat in an optical frequency comb

Review of Scientific Instruments, 2011

We describe a radio-frequency (RF) discriminator, or frequency-to-voltage converter, based on a v... more We describe a radio-frequency (RF) discriminator, or frequency-to-voltage converter, based on a voltage-controlled oscillator phase-locked to the signal under test, which has been developed to analyze the frequency noise properties of an RF signal, e.g., a heterodyne optical beat signal between two lasers or between a laser and an optical frequency comb. We present a detailed characterization of the properties of this discriminator and we compare it to three other commercially available discriminators. Owing to its large linear frequency range of 7 MHz, its bandwidth of 200 kHz and its noise floor below 0.01 Hz 2 /Hz in a significant part of the spectrum, our frequency discriminator is able to fully characterize the frequency noise of a beat signal with a linewidth ranging from a couple of megahertz down to a few hertz. As an example of application, we present measurements of the frequency noise of the carrier envelope offset beat in a low-noise optical frequency comb.

Research paper thumbnail of Spin Accumulation in Ferromagnetic/Normal and Ferromagnetic/Superconducting Systems

Research paper thumbnail of Superconducting Graphene Nanoelectronic Devices

Graphene, a single atom-thick sheet of graphite discovered in recent years, has attracted tremend... more Graphene, a single atom-thick sheet of graphite discovered in recent years, has attracted tremendous attention due to its exotic electronic properties. At low energy, its gapless linear band structure results in transport properties described by the Dirac equation, making it an ideal system for the study of exotic quantum phenomena and other new physics. Graphene may also exhibit many novel

Research paper thumbnail of Superconducting Graphene Nanoelectronic Devices

Graphene, a single atom-thick sheet of graphite discovered in recent years, has attracted tremend... more Graphene, a single atom-thick sheet of graphite discovered in recent years, has attracted tremendous attention due to its exotic electronic properties. At low energy, its gapless linear band structure results in transport properties described by the Dirac equation, making it an ideal system for the study of exotic quantum phenomena and other new physics. Graphene may also exhibit many novel

Research paper thumbnail of Spin Accumulation in Ferromagnetic/Normal and Ferromagnetic/Superconducting Systems

Research paper thumbnail of Frequency discriminators for the characterization of narrow-spectrum heterodyne beat signals: Application to the measurement of a sub-hertz carrier-envelope-offset beat in an optical frequency comb

Review of Scientific Instruments, 2011

We describe a radio-frequency (RF) discriminator, or frequency-to-voltage converter, based on a v... more We describe a radio-frequency (RF) discriminator, or frequency-to-voltage converter, based on a voltage-controlled oscillator phase-locked to the signal under test, which has been developed to analyze the frequency noise properties of an RF signal, e.g., a heterodyne optical beat signal between two lasers or between a laser and an optical frequency comb. We present a detailed characterization of the properties of this discriminator and we compare it to three other commercially available discriminators. Owing to its large linear frequency range of 7 MHz, its bandwidth of 200 kHz and its noise floor below 0.01 Hz 2 /Hz in a significant part of the spectrum, our frequency discriminator is able to fully characterize the frequency noise of a beat signal with a linewidth ranging from a couple of megahertz down to a few hertz. As an example of application, we present measurements of the frequency noise of the carrier envelope offset beat in a low-noise optical frequency comb.

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