Selective detection of bacterial layers with terahertz plasmonic antennas

TL;DR

This paper introduces a terahertz plasmonic antenna method for rapid, contactless, and selective detection of bacterial Gram types, improving diagnostic speed and specificity in microbial identification.

Contribution

It presents a novel application of terahertz antennas to enhance bacterial detection sensitivity and enable Gram type recognition.

Findings

Plasmonic antennas improve detection sensitivity for bacterial layers.

The method allows selective recognition of bacterial Gram types.

Terahertz spectroscopy provides rapid, damage-free microbial analysis.

Abstract

Current detection and identification of micro-organisms is based on either rather unspecific rapid microscopy or on more accurate complex, time-consuming procedures. In a medical context, the determination of the bacteria Gram type is of significant interest. The diagnostic of microbial infection often requires the identification of the microbiological agent responsible for the infection, or at least the identification of its family (Gram type), in a matter of minutes. In this work, we propose to use terahertz frequency range antennas for the enhanced selective detection of bacteria types. Several microorganisms are investigated by terahertz time-domain spectroscopy: a fast, contactless and damage-free investigation method to gain information on the presence and the nature of the microorganisms. We demonstrate that plasmonic antennas enhance the detection sensitivity for bacterial layers and allow the selective recognition of the Gram type of the bacteria.