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Multidimensional subwavelength position sensing using a semiconductor laser with optical feedback.

Seth D Cohen, Andrés Aragoneses, Damien Rontani

|November 2, 2013

Summary

This summary is machine-generated.

Researchers used quasi-periodic dynamics in a semiconductor laser to measure subwavelength changes in optical cavities. This novel method achieves nanoscale resolution for precise displacement measurements.

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Area of Science:

Optics and Photonics
Semiconductor Lasers
Nanotechnology

Background:

Quasi-periodic dynamics offer complex spectral properties.
Semiconductor lasers with optical feedback are sensitive to external perturbations.
Simultaneous measurement of subwavelength displacements is a key challenge in metrology.

Purpose of the Study:

To demonstrate harnessing quasi-periodic dynamics for precise metrology.
To develop a method for simultaneous, independent measurement of subwavelength displacements in dual optical feedback arms.
To achieve nanoscale resolution in displacement sensing.

Main Methods:

Experimental setup utilizing a semiconductor laser with dual optical feedback.
Exploiting the multifrequency spectrum arising from quasi-periodic dynamics.
Mapping unique frequency shifts to two-dimensional displacements in external cavity arms.

Main Results:

Successfully harnessed quasi-periodic dynamics for displacement sensing.
Demonstrated unique mapping of frequency shifts to cavity arm displacements.
Achieved an average nanoscale resolution of approximately 9.8 nm (~λ/160) at a telecommunication wavelength (λ≈1550 nm).

Conclusions:

Quasi-periodic dynamics in semiconductor lasers provide a robust platform for high-resolution metrology.
The demonstrated technique enables simultaneous and independent measurement of subwavelength displacements.
This method offers a promising approach for advanced sensing applications requiring nanoscale precision.