Radiant power flow and absorptance in thin films.

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Understanding light interaction with multilayer materials is crucial for optical device design.
• Existing models may not fully capture the behavior of absorbing multilayers.

Purpose of the Study:

• To develop a theoretical framework for analyzing radiant power, transmittance, and absorptance in absorbing multilayers.
• To apply these equations to the design of optical filters and coatings.
• To design and potentially fabricate ultraviolet (UV) bandpass filters.

Main Methods:

• Development of theoretical equations based on characteristic matrix and surrounding media admittance.
• Application of derived equations to specific optical filter designs.
• Design of UV bandpass filters incorporating multiple aluminum films.

Main Results:

• Formulation of equations governing radiant power flow, transmittance, and absorptance.
• Demonstration of the applicability of the equations to bandpass filter and absorbing coating design.
• Successful design of UV bandpass filters composed of several aluminum layers.

Conclusions:

• The developed equations provide a robust method for characterizing absorbing multilayers.
• The methodology facilitates the design of custom optical filters and coatings.
• The design of UV bandpass filters using aluminum films is feasible with this approach.