494 research outputs found
High frequency mechanical excitation of a silicon nanostring with piezoelectric aluminum nitride layers
A strong trend for quantum based technologies and applications follows the
avenue of combining different platforms to exploit their complementary
technological and functional advantages. Micro and nano-mechanical devices are
particularly suitable for hybrid integration due to the easiness of fabrication
at multi-scales and their pervasive coupling with electrons and photons. Here,
we report on a nanomechanical technological platform where a silicon chip is
combined with an aluminum nitride layer. Exploiting the AlN piezoelectricity,
Surface Acoustic Waves are injected in the Si layer where the material has been
localy patterned and etched to form a suspended nanostring. Characterizing the
nanostring vertical displacement induced by the SAW, we found an external
excitation peak efficiency in excess of 500 pm/V at 1 GHz mechanical frequency.
Exploiting the long term expertise in silicon photonic and electronic devices
as well as the SAW robustness and versatility, our technological platform
represents a strong candidate for hybrid quantum systems
Efeito da granulometria sobre o conteúdo energético do milho para frangos de corte.
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Magneto-optic transmittance modulation observed in a hybrid graphene-split ring resonator terahertz metasurface
By placing a material in close vicinity of a resonant optical element, its intrinsic optical response can be tuned, possibly to a wide extent. Here, we show that a graphene monolayer, spaced a few tenths of nanometers from a split ring resonator metasurface, exhibits a magneto-optical response which is strongly influenced by the presence of the metasurface itself. This hybrid system holds promises in view of thin optical modulators, polarization rotators, and nonreciprocal devices, in the technologically relevant terahertz spectral range. Moreover, it could be chosen as the playground for investigating the cavity electrodynamics of Dirac fermions in the quantum regime.The work was supported in part by the European Union Graphene Flagship under grant agreement n° 604391.This is the author accepted manuscript. The final version is available from AIP via http://dx.doi.org/10.1063/1.493170
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