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Updated: Apr 2, 2026

Trapping of Micro Particles in Nanoplasmonic Optical Lattice

Trapping of Micro Particles in Nanoplasmonic Optical Lattice

Published on: September 5, 2017

Surface imaging beyond the diffraction limit with optically trapped spheres.

Lars Friedrich^1,2, Alexander Rohrbach^1,3

¹Laboratory for Bio- and Nano-Photonics, Department of Microsystems Engineering - IMTEK, University of Freiburg, 79110 Freiburg, Germany.

Nature Nanotechnology

|September 29, 2015

Summary

This summary is machine-generated.

This study introduces a novel optical trap technique for high-resolution surface imaging and height profiling. The method achieves sub-diffraction limit resolution, offering a gentler approach than atomic force microscopy (AFM).

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Construction of a High Resolution Microscope with Conventional and Holographic Optical Trapping Capabilities

Construction of a High Resolution Microscope with Conventional and Holographic Optical Trapping Capabilities

Published on: April 22, 2013

Area of Science:

Bionanoscience
Nanotechnology
Optical Physics

Background:

Optical traps are increasingly used in bionanosciences for precise force application on microstructures.
Particle-tracking techniques combined with optical traps enable sensitive force detection.

Purpose of the Study:

To demonstrate reliable height profiling and surface imaging below the diffraction limit.
To develop a more sensitive alternative to atomic force microscopy (AFM) for surface analysis.

Main Methods:

Utilizing a time-shared twin-optical trap system.
Employing nanometre-precise three-dimensional interferometric particle tracking.
Leveraging high-energy thermal position fluctuations of the trapped probe.

Main Results:

Achieved spatial resolution below the diffraction limit for height profiling and surface imaging.
Demonstrated a sampling method 5,000 times softer than AFM.
Successfully measured height and force profiles of test structures and Helicobacter cells.

Conclusions:

The combined optical trap and tracking technique offers high-resolution surface analysis.
This method provides a sensitive, low-force approach for characterizing hard and soft surfaces.
Potential applications include uncovering specific properties of biological and material surfaces.