Three-dimensional nonparaxial characterization of physical point sources

Area of Science:

• Optics
• Nanotechnology
• Micro-optics

Background:

• Ideal optical point sources are theoretical constructs.
• Characterizing feasible physical point sources is crucial for micro- and nano-optics advancements.

Purpose of the Study:

• To investigate physical point source models in micro- and nano-optics.
• To establish criteria for feasible three-dimensional (3D) physical point sources.

Main Methods:

• Analyzing 3D distributions of real and virtual point emitters.
• Comparing the resulting energy cone geometry with ideal point source models.
• Developing a generalized criterion for physical point source feasibility.

Main Results:

• Certain 3D emitter distributions generate a nonparaxial energy cone matching the ideal point source geometry.
• This energy cone is valid for arbitrary and very short distances (sub-wavelength).

Conclusions:

• A generalized criterion for feasible 3D physical point sources is proposed.
• The findings have implications for the design and understanding of micro- and nano-optical systems.