Plasmon-Assisted Audio Recording

Hao Chen, Abdul M. Bhuiya, Qing Ding, Kimani C. Toussaint

Research output: Contribution to journalArticle

Abstract

We present the first demonstration of the recording of optically encoded audio onto a plasmonic nanostructure. Analogous to the â œ 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 œ 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.

Original languageEnglish (US)
Article number9125
JournalScientific reports
Volume5
DOIs
StatePublished - Mar 16 2015

ASJC Scopus subject areas

  • General

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    Chen, H., Bhuiya, A. M., Ding, Q., & Toussaint, K. C. (2015). Plasmon-Assisted Audio Recording. Scientific reports, 5, [9125]. https://doi.org/10.1038/srep09125