A pixelated frequency-agile metasurface for broadband terahertz molecular fingerprint sensing

Abstract

Terahertz (THz) plasmonic resonance based on the arbitrarily designed resonance metasurface is the key technique of choice for enhancing fingerprint absorption spectroscopy identification of biomolecules. Here, we report a broadband...

Ultrasensitive Terahertz Biodetection Enabled by Quasi‐BIC‐Based Metasensors

“…Point‐of‐care (POC) devices as fast detection, low‐cost and easy‐to‐use platforms are eagerly used for health monitoring and biosafety applications. [ 8–11 ] In this regard, terahertz (THz) plasmonic biosensors based on micro/nanoparticles and localized surface plasmon resonances (LSPR) metasurface have received tremendous attentions over the years due to their wide applications in biomedical imaging and diagnosis, [ 12–14 ] sensing, [ 15,16 ] safety inspections. They are label‐free, sensitive to weak bonding interactions and non‐invasive.…”

Identification and quantitative detection of two pathogenic bacteria based on a terahertz metasensor

“…31,32 For instance, ultra-sensitive THz metasensors have been proposed to distinguish extremely diluted concentrations of glucose, interleukin-6 (IL-6) and other biomolecular solutions. [33][34][35][36] Furthermore, the continuous optimization of the THz metasensors enables complex cell detection, including monitoring the carcinogenesis process of normal cells and discriminating the molecular typing of tumour cells, which is a major advance in the field of biosensing. [37][38][39] Arbitrary radiating metasurfaces can be analysed by an array of oscillating charge and loop currents, which involves the traditional concept of electric and magnetic multipoles, respectively.…”

THz enantiomers of drugs recognized by the polarization enhancement of gold nanoparticles on an asymmetric metasurface

“…Metasurfaces are artificial electromagnetic structures consisting of orderly arranged plane elements, 16 which can provide a strong field enhancement around the samples and sharp peaks in the transmission or reflection spectrum, thus improving the detection accuracy. [17][18][19][20][21][22][23][24] Through the reasonable design of the geometry of nanostructures, metasurfaces usually possess intrinsic chirality for electromagnetic waves with an appropriate wavelength, which is like enantiomers; therefore, chiral metasurfaces are also widely used in chiral detection. [25][26][27][28][29] For example, Shen et al proposed a concise and general design principle to develop chiral metasurfaces, empowered with the maximum theoretical circular dichroism, which can provide promising potential for chiral sensing.…”