Metallic nanoparticle on micro ring resonator for bio optical detection and sensing

Area of Science:

• Nanophotonics
• Optical Sensors
• Plasmonics

Background:

• Micro ring resonators are key components in integrated photonics.
• Dielectric nanoparticles typically induce a red shift in resonance wavelength.
• Understanding metallic nanoparticle interactions is crucial for advanced optical devices.

Purpose of the Study:

• To numerically investigate the unique optical effects of multiple gold (Au) nanoparticles on a 4-port micro ring resonator.
• To analyze the influence of Au nanoparticle characteristics on resonance wavelength and intensity.
• To explore the potential of Au nanoparticles in sensing and nanomedicine.

Main Methods:

• Numerical simulation of a 4-port micro ring resonator.
• Modeling the interaction of multiple Au nanoparticles with the resonator.
• Analysis of resonance wavelength shifts and drop port intensity variations.

Main Results:

• Gold nanoparticles induce a blue shift in resonance wavelength due to their optical properties (low real, high imaginary refractive index).
• Drop port intensity is highly sensitive to the number and size of Au nanoparticles.
• Nanoparticle position has a minimal effect on drop port intensity.
• Correlation between Au penetration depth and evanescent tail is observed.

Conclusions:

• Gold nanoparticles exhibit unique blue-shifting behavior in micro ring resonators.
• The sensitivity of drop port intensity to nanoparticle parameters highlights potential for sensing applications.
• The study reveals the distinct properties of Au nanoparticles for detection, sensing, and nanomedicine.