Optical filters with fractal transmission spectra based on diffractive optics

Area of Science:

• Optics and Photonics
• Diffraction Theory
• Spectroscopy

Background:

• Understanding the relationship between light distribution and spectral properties is crucial in optical system design.
• Circularly symmetric apertures are fundamental in various optical applications.
• Monochromatic and broadband illumination offer distinct insights into light-matter interactions.

Purpose of the Study:

• To highlight and experimentally investigate the duality between axial irradiance distribution and diffracted spectral intensity.
• To introduce novel applications based on this diffraction duality.
• To explore the potential of fractal structures in spectral filter design.

Main Methods:

• Theoretical analysis of the duality for circularly symmetric apertures.
• Experimental investigation using broadband light sources and spectrometers.
• Implementation and characterization of a fractal spectral filter.

Main Results:

• Experimental validation of the duality between axial irradiance and spectral intensity.
• Demonstration of a single-shot measurement technique for pupil filter axial response.
• Successful fabrication and characterization of a spectral filter with a fractal transmission spectrum.

Conclusions:

• The identified duality provides a powerful tool for optical analysis and measurement.
• The proposed single-shot measurement technique offers efficiency in characterizing optical components.
• Fractal spectral filters present new possibilities for synthetic spectra generation and advanced optical applications.