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2015 ; 5
(ä): 9125
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Plasmon-assisted audio recording
#MMPMID25773401
Chen H
; Bhuiya AM
; Ding Q
; Toussaint KC Jr
Sci Rep
2015[Mar]; 5
(ä): 9125
PMID25773401
show ga
We present the first demonstration of the recording of optically encoded audio
onto a plasmonic nanostructure. Analogous to the "optical sound" approach used in
the early twentieth century to store sound on photographic film, we show that
arrays of gold, pillar-supported bowtie nanoantennas could be used in a similar
fashion to store sound information that is transferred via an amplitude modulated
optical signal to the near field of an optical microscope. Retrieval of the audio
information is achieved using standard imaging optics. We demonstrate that the
sound information can be stored either as time-varying waveforms or in the
frequency domain as the corresponding amplitude and phase spectra. A "plasmonic
musical keyboard" comprising of 8 basic musical notes is constructed and used to
play a short song. For comparison, we employ the correlation coefficient, which
reveals that original and retrieved sound files are similar with maximum and
minimum values of 0.995 and 0.342, respectively. We also show that the pBNAs
could be used for basic signal processing by ablating unwanted frequency
components on the nanostructure thereby enabling physical notch filtering of
these components. Our work introduces a new application domain for plasmonic
nanoantennas and experimentally verifies their potential for information
processing.
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