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Phase-sensitive Bloch surface wave sensor based on variable angle spectroscopic ellipsometry.

Yanhui Li, Tianlin Yang, Zhiyong Pang

|October 17, 2014

Summary

This summary is machine-generated.

This study introduces a phase-sensitive Bloch surface wave (BSW) sensor. Phase detection offers a promising alternative to reflectivity for enhanced BSW sensor sensitivity and lower detection limits.

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Area of Science:

Photonics and Optics
Nanotechnology
Sensing Technologies

Background:

Bloch surface waves (BSWs) are electromagnetic surface waves supported by periodic dielectric structures.
Traditional BSW sensors often rely on reflectivity intensity changes for detection.
Sensitivity and limit of detection are critical parameters for sensor performance.

Purpose of the Study:

To propose and investigate a phase-sensitive Bloch surface wave (BSW) sensor.
To explore the potential of phase detection for BSW-based sensing applications.
To compare the performance of phase detection with traditional reflectivity detection.

Main Methods:

Numerical simulation of BSW excitation and phase behavior using variable angle spectroscopic ellipsometry.
Experimental validation of the proposed phase-sensitive BSW sensor.
Analysis of resonant phase dependence and reflectivity changes.

Main Results:

Simulations reveal a distinct step-like dependence of the resonant phase upon BSW excitation.
The phase change remains remarkable even with shallow reflectivity dips due to dielectric losses.
Experimental results demonstrate the potential for higher sensitivity and lower limit of detection using phase detection.

Conclusions:

Phase detection is a viable and potentially superior alternative to reflectivity intensity detection for BSW sensors.
The proposed phase-sensitive BSW sensor exhibits promising characteristics for advanced sensing applications.
Further development of phase detection methods can lead to significant improvements in sensor performance.