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Updated: Sep 1, 2025

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

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Published on: August 30, 2012

PLC-Based Integrated Refractive Index Sensor Probe with Partially Exposed Waveguide.

Jin Hwa Ryu¹, Hoesung Yang¹, Soyoung Park¹

¹Industrial & Personal Safety Intelligence Research Section, Electronics and Telecommunications Research Institute (ETRI), Daejeon 34129, Korea.

Sensors (Basel, Switzerland)

|August 12, 2022

Summary

This summary is machine-generated.

This study introduces a simple, efficient planar lightwave circuit (PLC) refractive index (RI) sensor. The novel U-shaped waveguide design achieves high sensitivity for RI measurements using a dip-type method.

Keywords:

U-shaped waveguide index contrast integrated PLC probe refractive index sensor trench

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Last Updated: Sep 1, 2025

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Area of Science:

Photonics
Optical Sensing
Waveguide Technology

Background:

Refractive index (RI) sensing is crucial in various scientific fields.
Existing RI sensors often face limitations in efficiency and structural complexity.
Planar lightwave circuit (PLC) technology offers a platform for integrated optical devices.

Purpose of the Study:

To propose and demonstrate a simple, high-efficiency refractive index sensor.
To leverage a planar lightwave circuit (PLC) probe-type structure for enhanced sensing.
To investigate a novel waveguide configuration for sensitive RI detection.

Main Methods:

A 1x2 splitter structure with reference and sensing channels was designed.
Each channel utilizes a U-shaped waveguide comprising C bends.
A trench structure in the sensing channel selectively exposes the core layer's sidewall.

Main Results:

The sensing channel exhibited a sensitivity of 2070 μW/RIU for RI changes from 1.385 to 1.445 at 1550 nm.
The reference channel showed minimal optical loss and zero sensitivity.
The sensor design allows for efficient RI measurement via a simple dip-type method.

Conclusions:

The proposed PLC-based RI sensor offers a simple and highly efficient sensing solution.
The U-shaped waveguide with a trench structure effectively modulates optical output power based on RI changes.
This technology holds promise for advanced applications requiring precise refractive index monitoring.