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Propagation of Waves

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Published on: March 20, 2017

On-chip wavefront shaping in spacing-varied waveguide arrays.

Yunfei Niu¹, Yunlong Niu^2,3, Xiaopeng Hu⁴

¹Research Center for Intelligent Optoelectronic Computing, Zhejiang Laboratory, Hangzhou 311100, China.

Nanophotonics (Berlin, Germany)

|December 16, 2024

Summary

This summary is machine-generated.

Researchers developed a novel wavefront shaping technique using waveguide arrays. This method enables precise control of light, offering versatile on-chip optical functions for advanced photonic integrated circuits.

Keywords:

integrated photonics wavefront shaping waveguide array

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Last Updated: Jun 5, 2025

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Area of Science:

Photonics and Optical Engineering
Integrated Optics
Wavefront Engineering

Background:

Photonic integrated circuits are crucial for high-capacity optical communication and information processing.
Efficient manipulation of light propagation is essential for these systems.
Existing methods face challenges in integration density and scalability.

Purpose of the Study:

To propose and demonstrate a new wavefront shaping method for photonic integrated circuits.
To utilize waveguide arrays with hyperbolic secant refractive index profiles for light control.
To achieve versatile optical functions on a chip.

Main Methods:

Theoretical analysis of diffraction and coherence properties of waveguide arrays.
Fabrication of devices on a silicon nitride waveguide platform.
Experimental demonstration of deterministic beam shaping functionalities.

Main Results:

A single waveguide array demonstrated both imaging and phase transformation capabilities, analogous to optical lenses.
Deterministic beam shaping, including focusing, expansion, collimation, and steering, was successfully realized.
The method was implemented on a silicon nitride platform.

Conclusions:

The proposed wavefront shaping method offers precise control over light propagation.
This technique has significant potential for on-chip optical routing, ranging, and sensing applications.
The approach provides high integration density and scalability for future photonic devices.