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Thermal Stress

Thermal Stress

If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...

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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...

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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

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Published on: August 30, 2012

Thermal stresses in optical waveguides.

¹Department of Mechanical & Aerospace Engineering and Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544, USA. minhuang@alumni.princeton.edu

|December 19, 2003

Summary

This summary is machine-generated.

Thermal stresses in optical waveguides significantly impact birefringence. New closed-form solutions reveal that core stress perpendicular to the wafer is crucial and can be tuned by adjusting thermal expansion mismatch.

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Area of Science:

Optics and Photonics
Materials Science and Engineering
Solid Mechanics

Background:

Birefringence in optical waveguides is a critical parameter influenced by internal stresses.
Anisotropy of thermal stresses within the waveguide core directly affects optical properties.
Understanding and predicting these stresses are essential for waveguide design and performance.

Purpose of the Study:

To develop closed-form analytical solutions for thermal stresses in embedded channel waveguides.
To investigate the significance of thermal stress components, particularly perpendicular to the wafer.
To explore methods for tuning the core stress anisotropy for optical applications.

Main Methods:

Derivation of closed-form analytical solutions for thermal stress distribution.
Verification of analytical solutions using finite-element method (FEM) simulations.
Parametric analysis of stress anisotropy based on material properties and geometry.

Main Results:

Closed-form solutions accurately predict thermal stresses in both core and cladding layers.
The thermal stress component perpendicular to the wafer is found to be significant and cannot be neglected.
Core stress anisotropy can be effectively tuned by manipulating the thermal-expansion mismatch between the upper cladding and the substrate.

Conclusions:

The presented analytical solutions provide an efficient tool for estimating thermal stresses in embedded channel waveguides.
Accurate consideration of through-wafer thermal stress is vital for predicting waveguide birefringence.
Material selection and design modifications offer a pathway to control stress-induced optical anisotropy.