Silicon Plasmonic Sensor for Biological Detection
Date
2025-10-25
Journal Title
Journal ISSN
Volume Title
Publisher
Department of Electrical and Electronic Engineering (EEE), Islamic University of Technology(IUT), Board Bazar, Gazipur-1704, Bangladesh
Abstract
The thesis presents a groundbreaking advancement in photonic biosensing through the
development of a CMOS-compatible plasmonic sensor that utilizes n-doped silicon as a
high-performance alternative to conventional noble metals. By fundamentally reimagining
both the material platform and structural design, this research overcomes the critical
limitations of traditional surface plasmon resonance systems, including high optical losses,
poor stability and fabrication incompatibility. Through systematic design evolution and
rigorous finite element method optimization, we have created an innovative
waveguide-coupled resonator architecture featuring embedded multi-ring nanostructures
and strategically positioned dielectric pillars. This sophisticated design achieves
exceptional performance metrics, demonstrating a sensitivity of 1270 nm/RIU and a figure
of merit of 22.3 that competes favorably with noble metal-based sensors while offering
superior integration capabilities. The sensor demonstrates precise identification of blood
components, clear differentiation of intracellular biomolecules and reliable distinction
between various tissue types. This research establishes a transformative foundation for
next-generation point-of-care diagnostics, offering a commercially viable pathway toward
scalable, cost-effective biosensing solutions. By bridging the critical gap between
laboratory performance and real-world clinical implementation, this work paves the way
for integrated lab-on-chip systems that combine high sensitivity with manufacturability,
potentially revolutionizing personalized medicine, environmental monitoring and
biomedical research.
Description
Supervised by
Dr. Rakibul Hasan Sagor,
Professor,
Department of Electrical and Electronic Engineering (EEE)
Islamic University of Technology (IUT)
Board Bazar, Gazipur, Bangladesh
This thesis is submitted in partial fulfillment of the requirement for the degree of Bachelor of Science in Electrical and Electronic Engineering, 2025
Keywords
Citation
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