Surface plasmon resonance (SPR) refers to the resonant oscillation of conduction electrons at a metal–dielectric interface excited by incident electromagnetic radiation under specific momentum-matching conditions. Surface plasmon–based sensors exploit this phenomenon to detect minute changes in the refractive index near the sensor surface, enabling highly sensitive, label-free detection. Within the broader category of plasmonic sensing, […]
India has taken a substantial leap forward in semiconductor technology with the launch of DHRUV64, the nation’s first fully indigenous 1.0 GHz, 64-bit dual-core microprocessor. Developed under the Microprocessor Development Programme (MDP) by the Centre for Development of Advanced Computing (C-DAC), DHRUV64 strengthens India’s microprocessor ecosystem and reduces dependence on imported chips for strategic and […]
1. Introduction: The Digital Twin of Plasmonic Sensing Surface Plasmon Resonance (SPR) represents one of the most powerful and sensitive label-free detection techniques in modern photonics. Characterized by the resonant oscillation of free electrons at a metal-dielectric interface, SPR sensors have found widespread applications in biosensing, chemical detection, and environmental monitoring. However, their development traditionally […]
Photonic Crystal Fiber (PCF) sensors represent a class of advanced optical fiber technologies that are revolutionizing the landscape of precision sensing. Unlike conventional step-index optical fibers, PCFs incorporate a microstructured arrangement of air holes along their length, giving them unique light-guiding properties. These periodic structures allow PCFs to confine and guide light either through modified […]
Introduction Surface Plasmon Resonance (SPR) sensors stand at the forefront of label-free biosensing technologies, relying on the excitation of surface plasmons—coherent electron oscillations—at metal-dielectric interfaces. The resonance condition, and hence the sensor’s response, is acutely sensitive to changes in the local refractive index, making SPR particularly valuable in the detection of biomolecules, chemicals, and environmental […]
Introduction Surface Plasmon Resonance Imaging (SPRi) has emerged as a vital optical sensing technique in the toolbox of modern biological research. Unlike conventional assays that depend on labeling or indirect detection, SPRi provides a label-free, real-time modality to monitor biomolecular interactions across multiple analytes simultaneously. This unique combination of high-throughput screening and non-destructive testing has […]
Introduction Photonic crystal fiber (PCF)-based gas cells (PCF Sensor) have emerged as an indispensable component in optical gas sensing, particularly in Raman and absorption-based techniques. These gas cells offer significant improvements over traditional sensing architectures by enhancing light-gas interaction length, enabling miniaturization, and offering higher sensitivity and selectivity. The structure of PCFs, characterized by microscopic […]
Introduction Zeta potential, often denoted as ζ-potential, is the electrokinetic potential that develops at the slipping plane of a particle in a liquid medium. It quantifies the electrical potential difference between the dispersion medium and the stationary layer of fluid attached to the dispersed particle. In simple terms, it measures the degree of electrostatic repulsion […]
Introduction Surface plasmon resonance (SPR) sensors have emerged as a critical innovation in the landscape of food safety and quality control. Defined as a label-free, real-time optical biosensing technique, SPR functions by detecting refractive index changes near a sensor surface, typically a gold film, allowing precise identification of biomolecular interactions. Its relevance in food safety […]
Introduction Surface Plasmon Resonance Imaging (SPRI) has emerged as a pivotal label-free optical technique that enables real-time observation of biomolecular interactions and cellular dynamics. Unlike conventional fluorescence-based assays, SPRI relies on monitoring changes in the refractive index at a metal-dielectric interface—typically involving gold films—making it highly sensitive to surface-bound molecular events. This unique capability allows […]
