Tunable sensitivity phase detection of transmitted-type dual-channel guided-mode resonance sensor based on...

Area of Science:

• Optics and Photonics
• Nanotechnology
• Sensor Technology

Background:

• Guided-mode resonance (GMR) sensors offer label-free detection capabilities.
• Phase-shifting interferometry (PSI) is a technique for precise optical phase measurement.
• Integrating GMR sensors with PSI can enhance detection sensitivity and resolution.

Purpose of the Study:

• To develop and characterize a transmitted-type dual-channel GMR sensor system.
• To implement PSI for tunable phase detection sensitivity in the GMR sensor.
• To evaluate the sensor's performance in terms of sensitivity and throughput.

Main Methods:

• Fabrication of the dual-channel GMR sensor using nanoimprinting and 3D printing.
• Implementation of a PSI system with a liquid crystal retarder and USB camera for image acquisition (five images in ~15s).
• Tuning of sensor detection sensitivity by adjusting the analyzer's rotation angle.

Main Results:

• The dual-channel GMR sensor system successfully integrated PSI for tunable sensitivity.
• An optimal detection sensitivity of 6.82×10(-4) RIU was experimentally achieved.
• The system demonstrated potential for high throughput sensing applications.

Conclusions:

• The proposed transmitted-type dual-channel GMR sensor with PSI offers a promising platform for sensitive and tunable biosensing.
• The ability to tune sensitivity by adjusting the analyzer angle provides flexibility for different detection requirements.
• This integrated approach advances the development of high-performance optical sensors.