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Determination of Crystal Structures

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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

An angle-selective photonic crystal for multi-physical sensing applications.

Na Pei¹, Bao-Fei Wan², Hao-Cheng Ma²

¹School of Integrated Circuit Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China.

Physical Chemistry Chemical Physics : PCCP

|December 17, 2024

Summary

This study introduces a high-transmission photonic crystal sensor for real-time monitoring. The device accurately measures plasma density and refractive index changes, crucial for healthcare and environmental applications.

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Last Updated: Jul 17, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Area of Science:

Photonics and Metamaterials
Sensor Technology
Applied Physics

Background:

Photonic crystals (PCs) offer unique wave manipulation properties.
Optimizing PCs for specific frequencies and wave polarizations is key for device performance.
Sensing applications require structures that can detect subtle environmental changes.

Purpose of the Study:

To develop a high-transmission photonic crystal sensor capable of simultaneous refractive index and plasma density sensing.
To engineer a photonic crystal structure optimized for TM waves at 43.8 GHz with angle selection capabilities.
To assess the sensor's performance in detecting variations relevant to healthcare and environmental monitoring.

Main Methods:

Utilized photonic band gap (PBG) principles to design and optimize a photonic crystal structure.
Integrated refractive index sensing (RIS) and plasma density sensing (PDS) functionalities into a multi-physical sensor (MS).
Evaluated sensor performance by measuring transmission efficiency, critical angle, and sensitivity across different magnetic field intensities and plasma concentrations.

Main Results:

Achieved high transmission (>80%) for TM waves within a wide angular range (-68° to 0°).
Demonstrated sensitive plasma density detection (0.4–0.8 × 10^18 m^-3) with a sensitivity of 10.925° per m^-3.
Showcased broad refractive index detection ranges (e.g., 2.45-1.97) with high sensitivities across various magnetic field strengths, maintaining >0.8 transmission from -60° to 0°.

Conclusions:

The developed photonic crystal multi-physical sensor enables dynamic angle selection for simultaneous RIS and PDS.
The sensor exhibits promising real-time monitoring capabilities for refractive index and plasma density.
Potential applications include early disease diagnosis, air quality monitoring, and detecting metabolic activity or harmful substances.