Dr. Ashraf H. Badawi Profile

Dr. Ashraf H. Badawi

at Zewail City of Science and Technology

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Proceedings Article | 15 September 2016 Presentation + Paper

Active control of nano dimers response using piezoelectric effect

Ahmed Mekkawy, Tamer Ali, Ashraf Badawi

Proceedings Volume 9927, 99270F (2016) https://doi.org/10.1117/12.2237838

KEYWORDS: Particles, Control systems, Plasmonics, Sensors, Ferroelectric materials, Electroluminescent displays, Actuators, Plasmons, Ceramics, Dielectrics

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Nano devices can be used as building blocks for Internet of Nano-Things network devices, such as sensors/actuators, transceivers, and routers. Although nano particles response can be engineered to fit in different regimes, for such a nano particle to be used as an active nano device, its properties should be dynamically controlled. This controllability is a challenge, and there are many proposed techniques to tune nanoparticle response on the spot through a sort of control signal, wither that signal is optical (for all-optical systems) or electronic (for opto-electronic systems). This will allow the use of nano particles as nano-switches or as dynamic sensors that can pick different frequencies depending on surrounding conditions or depending on a smart decisions. In this work, we propose a piezoelectric substrate as an active control mediator to control plasmonic gaps in nano dimers. This method allows for integrating nano devices with regular electronics while communicating control signals to nano devices through applying electric signals to a piezoelectric material, in order to control the gaps between nano particles in a nano cluster. We do a full numerical study to the system, analyzing the piezoelectric control resolution (minimum gap change step) and its effect on a nanodimer response as a nanoantenna. This analysis considers the dielectric functions of materials within the visible frequencies range. The effects of different parameters, such as the piezoelectric geometrical structure and materials, on the gap control resolution and the operating frequency are studied.

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