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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

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Optical phase conjugation (OPC)-assisted isotropic focusing.

Mooseok Jang¹, Anne Sentenac, Changhuei Yang

¹Electrical Engineering, California Institute of Technology, 1200 E California Boulevard, Pasadena, California 91125, USA. mjang@caltech.edu

|April 11, 2013

Summary

Optical phase conjugation (OPC) enables isotropic optical focusing, achieving axial and lateral light confinement. This method overcomes challenges in objective lens alignment and sample turbidity for improved microscopy and patterning.

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Area of Science:

Optics
Microscopy
Photonics

Background:

Isotropic optical focusing, crucial for applications, conventionally uses paired objective lenses.
Conventional methods face limitations due to stringent alignment requirements and poor tolerance to sample turbidity.

Purpose of the Study:

To present a novel optical phase conjugation (OPC)-assisted method for isotropic optical focusing.
To overcome the limitations of conventional methods regarding objective lens misalignment and sample scattering.

Main Methods:

Utilizing the time-reversal property of OPC to ensure automatic overlap of dual focused beams.
Demonstrating robust focusing despite significant transverse (140 microns) and axial (80 microns) misalignment of objective lenses.

Main Results:

Achieved isotropic focusing through thick scattering samples (approximately 7 scattering mean free paths).
Successfully compensated for sample turbidity using OPC's scattering correction capabilities.

Conclusions:

The OPC-assisted method offers a robust solution for isotropic optical focusing.
Potential applications include advancements in 4Pi microscopy and 3D microstructure patterning.