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Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Second-harmonic focusing by a nonlinear turbid medium via feedback-based wavefront shaping.

Yanqi Qiao, Yajun Peng, Yuanlin Zheng

|May 16, 2017

Summary

Researchers demonstrate focusing second-harmonic waves in nonlinear turbid media using wavefront shaping. This technique enables controllable manipulation of scattered light for efficient nonlinear signal transmission.

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Area of Science:

Optics and Photonics
Nonlinear Optics
Wave Phenomena

Background:

Scattering in optical systems is typically viewed as a limitation for focusing and imaging.
Recent advancements reveal that scattering materials can be harnessed to focus coherent light through incident light manipulation.

Purpose of the Study:

To present the purposeful focusing of second-harmonic waves generated and scattered from nonlinear turbid media.
To demonstrate flexible manipulation of disordered linear and nonlinear scattering signals.

Main Methods:

Utilizing feedback-based wavefront shaping to control incident light.
Employing nonlinear turbid media for second-harmonic wave generation and scattering.
Analyzing disordered linear and nonlinear scattering signals.

Main Results:

Achieved purposeful focusing of second-harmonic waves in nonlinear turbid media.
Demonstrated flexible manipulation of both linear and nonlinear scattering signals.
Indicated increased controllable degrees of freedom for describing turbid media.

Conclusions:

The presented technique offers a method for efficient transmission of nonlinear signals to a desired location as a focal point or pattern.
This approach combines random nonlinear optics with wavefront shaping, opening possibilities for future applications.
Potential future applications include nonlinear transmission matrices, multi-frequency imaging, and phase-matching-free nonlinear optics.