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Extended broadband achromatic reflective-type waveplate.

Yi-Jun Jen¹, Meng-Jie Lin, Shun-Kai Yu

¹Department of Electro-Optical Engineering, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan. jyjun@ntut.edu.tw

|October 18, 2012

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Researchers developed a broadband achromatic waveplate using a symmetrical film stack on a silver mirror. This design achieves uniform phase retardation across a wide spectrum, enhancing optical performance.

Area of Science:

Optics and Photonics
Materials Science

Background:

Achieving broadband achromatic waveplates is crucial for advanced optical systems.
Reflective-type waveplates offer advantages in certain applications.
Designing for uniform phase retardation across passband and stopband is challenging.

Purpose of the Study:

To demonstrate the feasibility of a symmetrical film stack for broadband phase retardation.
To investigate the achromatic performance of a specific film stack composition.
To enable the design of reflective-type achromatic waveplates.

Main Methods:

Applying a symmetrical film stack onto a silver mirror.
Utilizing at least one anisotropic thin film within the stack.
Selecting specific birefringence and thickness for thin film components.

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Investigating a stack composed of anisotropic and isotropic Ta(2)O(5) thin films.

Main Results:

The symmetrical film stack achieved broadband phase retardation.
The design functions effectively as a reflective-type achromatic waveplate.
Uniform phase retardation was observed in both passband and stopband.
The Ta(2)O(5) based stack demonstrated achromatic performance.

Conclusions:

Symmetrical film stacks are feasible for creating broadband achromatic waveplates.
Tailoring birefringence and thickness of anisotropic films is key to uniform phase retardation.
The investigated Ta(2)O(5) film stack shows promise for achromatic optical applications.