Bilayer-film-decorated microsphere with suppressed interface reflection for enhanced nano-imaging

Area of Science:

• Optics and Photonics
• Materials Science
• Nanotechnology

Background:

• Microspheres serve as powerful optical lenses, offering super-focusing and high resolution in imaging applications.
• Interface reflections between microspheres and sample surfaces create Newton's rings, degrading nano-imaging quality.
• Existing methods lack effective strategies to mitigate these detrimental interface reflections.

Purpose of the Study:

• To propose and demonstrate a novel method for suppressing interface reflection in microsphere-based nano-imaging.
• To enhance the imaging contrast and effective field-of-view of microsphere nano-imaging systems.
• To develop a universally applicable light manipulation scheme for microsphere optical applications.

Main Methods:

• Designing a dielectric bilayer thin film to decorate microspheres.
• Utilizing particle swarm optimization and full-wave simulation for design refinement.
• Implementing a novel fabrication strategy for the decorated microspheres.

Main Results:

• Substantial diminution of the Newton's rings pattern in virtual images.
• Significant improvement in imaging contrast.
• Enhanced effective field-of-view in microsphere nano-imaging.

Conclusions:

• Decorating microspheres with a dielectric bilayer thin film effectively suppresses interface reflections.
• This approach substantially enhances microsphere nano-imaging performance, including contrast and field-of-view.
• The developed light manipulation scheme holds broad applicability for improving microsphere-based optical devices.