Design and analysis of optical sensors composed of large arrays of nanowires using the surface impedance generating operator (SIGO) method

Abstract

The design and analysis of large arrays of nanoscale scattering elements using existing computational tools is particularly difficult. Such difficulty mainly arises from large number of unknowns and the way existing CAD tools handle the analysis of complex nanostructures. In this work, a simple, reliable and fast analytical tool is introduced based on the surface impedance generating operator method, which not only reduces the number of unknowns through surface discretisation of the scatterers but can also be implemented in a parallel process, reducing simulation time. Circular and linear arrays of nanowires are designed using the proposed method to have a directive pattern and to be deployed in a rake-shaped optical probe head. The far-field scattering patterns of the arrays are investigated. In addition, the effects of array configuration as well as the number of elements and their properties on the directivity and beamwidth of the scattering patterns are also evaluated. Finally, high-resolution directive scanning probes made of a circular array of 31 gold nanowires and a linear array of 15 elements are designed at 800 nm with less than 3°beamwidth.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

Design of the Urban Lighting Control System Based on Optical Multisensor Technology and the GM Model

“…Optical Sensors. Urban lighting control systems rely heavily on optical sensors, which are devices that can detect and quantify light or electromagnetic waves [7]. Figure 1 depicts the primary uses for four diferent types of optical sensors that are frequently employed: light intensity sensors, color sensors, motion sensors, and occupancy sensors.…”