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Vorträge und Posterpräsentationen (mit Tagungsband-Eintrag):

N. Cazier, P. Sadeghi, M. Shawrav, A. Steiger-Thirsfeld, S. Schmid:
"Gap plasmon resonance in electromagnetically-actuated nanomechanicalsilicon nitride strings";
Vortrag: Nanophotonics and Micro/Nano Optics International Conference 2017, Barcelona; 13.09.2017 - 15.09.2017; in: "Nanophotonics and Micro/Nano Optics International Conference 2017 Book of Abstracts", (2017), S. 62.



Kurzfassung deutsch:
We present a new kind of electromagnetically-actuated nanoplasmomechanical string
resonator. This nanomechanical resonator is made of two gold covered silicon nitride
(SiN) strings separated by a 100 nm wide gap. These strings were cut into a SiN
membrane with focused ion beam milling, as shown in the SEM image of the
resonator on Figure 1. Besides supporting the induced plasmon resonance, the gold
strips additionally act as actuation elements, being electrically connected. Placed in a
static magnetic field (using neodymium magnets), the nanomechanical resonators are
actuated by passing an oscillating current through one of the strings (see the
schematic of the experimental setup on Figure 2). The induced Lorentz force makes
the string vibrate, which varies the gap size between the two SiN strings. The string
vibration is detected from the modulation of a tunable probe laser polarized
perpendicularly to the direction of the strings, with a maximal scattering at the
mechanical resonance frequency of the electromagnetically-actuated string. This can
be seen on Figure 3, where we plotted the measured optical intensity and phase of the
transmitted signal as a function of the frequency of the oscillating current, for an
applied voltage of 1 mV and a laser wavelength of 780 nm. This kind of structure
enables the investigation of the plasmonic resonances of plasmonic structures in close
proximity, by electromagnetically-controlling the distance between those structures.
This is particularly interesting in order to analyze the internal optical forces between
plasmonic structures or to study quantum phenomena such as tunneling effects
between these structures for gaps smaller than 1 nm.

Kurzfassung englisch:
We present a new kind of electromagnetically-actuated nanoplasmomechanical string
resonator. This nanomechanical resonator is made of two gold covered silicon nitride
(SiN) strings separated by a 100 nm wide gap. These strings were cut into a SiN
membrane with focused ion beam milling, as shown in the SEM image of the
resonator on Figure 1. Besides supporting the induced plasmon resonance, the gold
strips additionally act as actuation elements, being electrically connected. Placed in a
static magnetic field (using neodymium magnets), the nanomechanical resonators are
actuated by passing an oscillating current through one of the strings (see the
schematic of the experimental setup on Figure 2). The induced Lorentz force makes
the string vibrate, which varies the gap size between the two SiN strings. The string
vibration is detected from the modulation of a tunable probe laser polarized
perpendicularly to the direction of the strings, with a maximal scattering at the
mechanical resonance frequency of the electromagnetically-actuated string. This can
be seen on Figure 3, where we plotted the measured optical intensity and phase of the
transmitted signal as a function of the frequency of the oscillating current, for an
applied voltage of 1 mV and a laser wavelength of 780 nm. This kind of structure
enables the investigation of the plasmonic resonances of plasmonic structures in close
proximity, by electromagnetically-controlling the distance between those structures.
This is particularly interesting in order to analyze the internal optical forces between
plasmonic structures or to study quantum phenomena such as tunneling effects
between these structures for gaps smaller than 1 nm.

Erstellt aus der Publikationsdatenbank der Technischen Universitšt Wien.