Abstract by Ethan Edwards

Personal Infomation

Presenter's Name

Ethan Edwards

Degree Level


Abstract Infomation


Physics and Astronomy

Faculty Advisor

Steven Turley


The Effects of Roughness on Reflection


When the wavelength of incident light is comparable with the length scale of a surface’s roughness, physical and geometrical optics approximations of reflectance fail. Since even the smoothest surfaces have nanometer-scale roughness, finding alternatives to these approximations is important for wavelengths between 1 and 30 nm. To directly calculate far-field reflectance, one can use a boundary integral equation derived from Maxwell’s equations. I will outline an approach I am using to calculate reflectance with this method which removes the deficiencies of other approximations. I will outline the theory behind this approach and its numerical implementation. Previous research indicates that rms surface roughness greater than 1% of the incident light’s wavelength noticeably affects reflectance. I will show how I plan to use this calculation to compute the effects of roughness on the efficiency and resolution of a diffraction grating for use in the extreme ultraviolet.