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Force Spectroscopy of Single Protein Molecules Using an Atomic Force Microscope

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Published on: February 28, 2019

Coherent Bichromatic Force Deflection of Molecules.

Ivan Kozyryev^1,2, Louis Baum^1,2, Leland Aldridge³

¹Harvard-MIT Center for Ultracold Atoms, Cambridge, Massachusetts 02138, USA.

Physical Review Letters

|February 27, 2018

Summary

Scientists used a coherent optical bichromatic force to precisely control the motion of strontium monohydroxide (SrOH) molecules. This technique allows for directional manipulation and potential deceleration of molecules, opening new avenues in molecular control.

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Area of Science:

Atomic, Molecular, and Optical Physics
Quantum Control of Molecules

Background:

Coherent control of molecular motion is crucial for advanced applications.
Optical forces offer non-contact methods for manipulating neutral atoms and molecules.

Purpose of the Study:

To demonstrate and characterize the coherent optical bichromatic force on polar molecules.
To investigate the directional momentum transfer and control of molecular beams.

Main Methods:

Utilizing a dual-frequency retroreflected laser beam to address the X$^{2}$Σ$^{+}$↔A$^{2}$Π$_{1/2}$ transition in SrOH.
Applying the coherent optical bichromatic force to a cryogenic beam of SrOH molecules.
Direct numerical solution of the time-dependent density matrix for modeling.

Main Results:

Achieved transverse deflection of SrOH molecules via a bichromatic force.
Demonstrated reversal of the force direction by adjusting laser phase.
Attained momentum transfer of 70ℏk with minimal molecular loss.

Conclusions:

The coherent optical bichromatic force effectively controls molecular motion.
This method enables efficient optical deceleration of molecules with complex structures.
Opens possibilities for advanced coherent manipulation of molecular trajectories.