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Related Experiment Video

Updated: May 7, 2026

Fabrication of Carbon Nanotube High-Frequency Nanoelectronic Biosensor for Sensing in High Ionic Strength Solutions

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Silicon nanowire based angle robust ultrasensitive hyperbolic metamaterial biosensor.

Badhan Golder¹, Zahidul Salman¹, Rony Das¹

¹Department of Electrical and Electronic Engineering, Shahjalal University of Science and Technology Sylhet-3114 Bangladesh arif-eee@sust.edu.

Nanoscale Advances

|October 29, 2025

Summary

This study introduces an angle-robust hyperbolic metamaterial biosensor using silicon nanowires for ultra-sensitive virus detection. It achieves high sensitivity and an unprecedented limit of detection for dengue virus NS1 protein.

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Area of Science:

* Nanophotonics and Metamaterials
* Biosensing and Nanotechnology
* Condensed Matter Physics

Background:

* Metamaterials offer unique electromagnetic properties not found in nature.
* Biosensors are crucial for early disease detection.
* Developing angle-insensitive biosensors enhances practical applications.

Purpose of the Study:

* To design and analyze an angle-robust hyperbolic metamaterial biosensor.
* To investigate its performance for label-free virus detection.
* To achieve ultra-high sensitivity and a low limit of detection.

Main Methods:

* Finite-Difference Time-Domain (FDTD) method for resonance shift analysis.
* Effective Medium Theory (EMT) for hyperbolic property examination.
* Transfer Matrix Method (TMM) for theoretical verification.
* Analysis of dispersion relation for sensitivity optimization.

Main Results:

* Demonstrated perfect reflectance shift and extreme anisotropic properties at NIR wavelengths.
* Achieved angle-insensitivity due to hyperbolic dispersion relation.
* Exhibited high sensitivity (14 nm/NS1 protein) and mass sensitivity (0.192 nm kDa⁻¹).
* Reached an unprecedented limit of detection (LOD) of 0.691 pM for dengue NS1 protein.

Conclusions:

* The proposed n-doped silicon nanowire hyperbolic metamaterial biosensor is angle-robust.
* It enables ultra-sensitive, label-free detection of viruses like dengue.
* The design holds potential for detecting various nanoscale biological targets.