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Related Experiment Video

Updated: Jun 27, 2026

$Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing$

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing

Published on: April 25, 2019

Binary sub-wavelength diffractive lenses with long focal depth and high transverse resolution.

Di Feng¹, Pan Ou, Li-Shuang Feng

¹Department of Electro-Optical Engineering, School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100083, PR China. fengdi@tsinghua.org.cn

|December 10, 2008

Summary

This study demonstrates that two-dimensional binary sub-wavelength diffractive lenses (BSDLs) achieve extended focal depth and high transverse resolution. Modulating BSDL features enhances micro-optical system performance.

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Published on: December 8, 2016

Area of Science:

Optics
Electromagnetism
Nanophotonics

Background:

Sub-wavelength diffractive lenses (BSDLs) are crucial for miniaturized optical systems.
Achieving both long focal depth and high transverse resolution simultaneously remains a challenge.

Purpose of the Study:

To explore two-dimensional binary sub-wavelength diffractive lenses (BSDLs) for enhanced focusing performance.
To investigate the impact of modulating BSDL characteristics on focal depth and transverse resolution.

Main Methods:

Utilizing rigorous electromagnetic theory.
Employing the finite-difference time-domain (FDTD) method for numerical simulations.
Analyzing focusing performance for varying f-numbers under TE polarization.

Main Results:

Designed BSDLs exhibit significantly long focal depth.
High transverse resolution is achieved, evidenced by a small central lobe spot size.
Performance is directly linked to the modulation of binary sub-wavelength feature sizes.

Conclusions:

BSDLs offer a viable solution for long focal depth and high transverse resolution.
The design approach provides valuable insights for BSDLs in micro-optical applications.
Monolithic integration and single-step fabrication potential of BSDLs are highlighted.