Mr. Juan Manuel Gomez-Cruz Profile

Juan Manuel Gomez-Cruz

Student at UNAM

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Proceedings Article | 25 August 2017 Paper

Flow-through nanohole array based sensor implemented on analogue smartphone components

Juan Gomez-Cruz, Srijit Nair, Gabriel Ascanio, Carlos Escobedo

Proceedings Volume 10346, 1034624 (2017) https://doi.org/10.1117/12.2272433

KEYWORDS: Plasmonics, Sensors, Surface plasmons, Ion beams, Biosensors, Mobile communications, Consumer electronics, Point-of-care devices, Environmental monitoring, Explosives detection

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Mobile communications have massively populated the consumer electronics market over the past few years and it is now ubiquitous, providing a timeless opportunity for the development of smartphone-based technologies as point-of-care (POC) diagnosis tools¹ . The expectation for a fully integrated smartphone-based sensor that enables applications such as environmental monitoring, explosive detection and biomedical analysis has increased among the scientific community in the past few years^2,3. The commercialization forecast for smartphone-based sensing technologies is very promising, but reliable, miniature and cost-effective sensing platforms that can adapt to portable electronics in still under development. In this work, we present an integrated sensing platform based on flow-through metallic nanohole arrays. The nanohole arrays are 260 nm in diameter and 520 nm in pitch, fabricated using Focused Ion Beam (FIB) lithography. A white LED resembling a smartphone flash LED serves as light source to excite surface plasmons and the signal is recorded via a Complementary Metal-Oxide-Semiconductor (CMOS) module. The sensing abilities of the integrated sensing platform is demonstrated for the detection of (i) changes in bulk refractive index (RI), (ii) real-time monitoring of surface modification by receptor-analyte system of streptavidin-biotin.

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