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Trapping light that doesn't bounce off track for faster electronics

Date:
July 30, 2018
Source:
Purdue University
Summary:
A new protective metamaterial 'cladding' prevents light from leaking out of the very curvy pathways it would travel in a computer chip.
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Replacing traditional computer chip components with light-based counterparts will eventually make electronic devices faster due to the wide bandwidth of light.

A new protective metamaterial "cladding" prevents light from leaking out of the very curvy pathways it would travel in a computer chip.

Because processing information with light can be more efficient than with electrons used in current devices, there is good reason to confine light onto a chip. But light and the bits of information it carries tend to leak and scatter out of the tiny components that must fit on a chip.

A Purdue University-led effort has built a novel cladding along the highways for light travel, called waveguides, to prevent information leaks -- particularly around sharp bends where light bounces off track and scatters. Information then gets lost or jumbled rather than communicated throughout a device. Preventing this could facilitate the integration of photonic with electric circuitry, increasing communication speed and reducing power consumption.

"We want the bits of information that we are sending in the waveguide to travel along tight bends and simultaneously not be lost as heat. This is a challenge," said Zubin Jacob, Purdue assistant professor of electrical and computer engineering.

What makes the waveguide cladding so unique is anisotropy, meaning that the cladding design enables light to travel at different velocities in different directions. By controlling the anisotropy of the cladding, the researchers prevented light from leaking off track into other waveguides where "crosstalk," or mixing, of information would occur. Instead, bits of information carried by light bounce off by "total internal reflection" and stay strongly confined within a waveguide.

"The waveguide we made is an extreme skin-depth structure, which means that any leakage that does happen will be really small," said Saman Jahani, Purdue graduate research assistant in electrical and computer engineering. "This approach can pave the way for dense photonic integration on a computer chip without worrying about light leakage."


Story Source:

Materials provided by Purdue University. Note: Content may be edited for style and length.


Journal Reference:

  1. Saman Jahani, Sangsik Kim, Jonathan Atkinson, Justin C. Wirth, Farid Kalhor, Abdullah Al Noman, Ward D. Newman, Prashant Shekhar, Kyunghun Han, Vien Van, Raymond G. DeCorby, Lukas Chrostowski, Minghao Qi, Zubin Jacob. Controlling evanescent waves using silicon photonic all-dielectric metamaterials for dense integration. Nature Communications, 2018; 9 (1) DOI: 10.1038/s41467-018-04276-8

Cite This Page:

Purdue University. "Trapping light that doesn't bounce off track for faster electronics." ScienceDaily. ScienceDaily, 30 July 2018. <www.sciencedaily.com/releases/2018/07/180730145421.htm>.
Purdue University. (2018, July 30). Trapping light that doesn't bounce off track for faster electronics. ScienceDaily. Retrieved October 4, 2024 from www.sciencedaily.com/releases/2018/07/180730145421.htm
Purdue University. "Trapping light that doesn't bounce off track for faster electronics." ScienceDaily. www.sciencedaily.com/releases/2018/07/180730145421.htm (accessed October 4, 2024).

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