Plasmon-Coupled Photocapacitor Neuromodulators.

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ID: 264830
2020
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Abstract
Efficient transduction of optical energy to bioelectrical stimuli is an important goal for effective communication with biological systems. For that, plasmonics has a significant potential via boosting the light-matter interactions. However, plasmonics has been primarily used for heat-induced cell stimulation due to membrane capacitance change (i.e., optocapacitance). Instead, here, we demonstrate that plasmonic coupling to photocapacitor biointerfaces improves safe and efficacious neuromodulating displacement charges for an average of 185% in the entire visible spectrum while maintaining the faradic currents below 1%. Hot-electron injection dominantly leads the enhancement of displacement current in the blue spectral window, and the nanoantenna effect is mainly responsible for the improvement in the red spectral region. The plasmonic photocapacitor facilitates wireless modulation of single cells at three orders of magnitude below the maximum retinal intensity levels, corresponding to one of the most sensitive optoelectronic neural interfaces. This study introduces a new way of using plasmonics for safe and effective photostimulation of neurons and paves the way toward ultrasensitive plasmon-assisted neurostimulation devices.
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melikov2020plasmoncoupledacs Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Melikov, Rustamzhon;Srivastava, Shashi Bhushan;Karatum, Onuralp;Dogru-Yuksel, Itir Bakis;Bahmani Jalali, Houman;Sadeghi, Sadra;Dikbas, Ugur Meric;Ulgut, Burak;Kavakli, Ibrahim Halil;Cetin, Arif E;Nizamoglu, Sedat;
Journal ACS applied materials & interfaces
Year 2020
DOI
10.1021/acsami.0c09455
URL
Keywords
plasmonics charge transfer biointerface nanoislands organic polymers photocapacitor photostimulation

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