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Cryogenic confocal microscopy with rotation in a magnetic field
T Kehoe1, M Ediger, R T Phillips
1Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
The Review of Scientific Instruments
|February 2, 2010
Summary
Researchers developed two magneto-optical confocal spectroscopy systems allowing rotation within a magnetic field. These systems enable the study of single quantum emitters across various angles and field strengths, offering improved optical throughput and manufacturing tolerances.
Area of Science:
- Optics and Spectroscopy
- Quantum Physics
- Materials Science
Background:
- Magneto-optical spectroscopy is crucial for probing magnetic properties of materials.
- Confocal microscopy offers high spatial resolution for studying nanoscale phenomena.
- Integrating these techniques requires overcoming challenges in sample manipulation and optical alignment within magnetic fields.
Purpose of the Study:
- To present and evaluate two novel magneto-optical confocal spectroscopy setups.
- To investigate the feasibility of rotating the confocal head relative to a magnetic field.
- To assess the performance and practical applicability of these systems for studying quantum emitters.
Main Methods:
- Development of two distinct magneto-optical confocal spectroscopy systems.
- Implementation of a rotatable confocal head design relative to the magnetic field.
- Utilizing a coudé arrangement and a single-mode optical fiber transport system for optical signal delivery.
- Characterization of cryogenic fiber-coupling objectives and lens alignment tolerances.
- Testing system rigidity and stability using commercial positioners under varying magnetic field strengths and angles.
Main Results:
- The coudé arrangement provided adequate performance for scanned imaging.
- The optical fiber transport system exhibited higher optical throughput compared to the coudé setup.
- Lens alignment tolerances were found to be relatively non-critical, simplifying manufacturing.
- The rotating confocal system demonstrated sufficient rigidity for studying single quantum emitters.
- Asymmetric weight distribution and diamagnetic forces were minimal, enabling studies over a range of angles and field strengths.
Conclusions:
- Both developed magneto-optical confocal spectroscopy systems are viable for studying quantum emitters.
- The optical fiber-based system offers superior optical throughput.
- The systems allow for versatile angular and magnetic field-dependent measurements.
- The designs facilitate practical implementation without requiring specialized manufacturing techniques.
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