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Plasmonic-multimode-interference-based logic circuit with simple phase adjustment.

Masashi Ota¹, Asahi Sumimura¹, Masashi Fukuhara¹

¹Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi-shi, Aichi 441-8580, Japan.

Scientific Reports

|April 19, 2016

Summary

Researchers developed plasmonic multimode interference (MMI) devices for all-optical logic circuits. These devices enable simple phase adjustment for high-speed, high-density integration beyond light

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Area of Science:

Plasmonics
Nanophotonics
Optical Computing

Background:

All-optical logic circuits using surface plasmon polaritons (SPPs) offer potential for high-speed information processing and high-density integration.
Cascading logic gates is challenging due to complex signal phase adjustment requirements.

Purpose of the Study:

To demonstrate a half-adder operation with simplified phase adjustment using plasmonic multimode interference (MMI) devices.
To enable simultaneous XOR and AND gate operations for advanced optical computing.

Main Methods:

Fabrication of plasmonic MMI devices using dielectric stripes on a metal film via a complementary metal-oxide semiconductor (CMOS)-compatible process.
Experimental validation using scanning near-field optical microscopy (SNOM).
Integration of 1x1 MMI phase adjusters and 2x2 MMI intensity modulators.

Main Results:

Successful demonstration of a half-adder operation with simple phase adjustment.
Experimental confirmation of simultaneous XOR and AND gate operations.
Achieved an on-off ratio of at least 4.3 dB.

Conclusions:

The proposed plasmonic MMI structure facilitates efficient all-optical logic operations.
CMOS-compatible fabrication and printing techniques enable scalable production of high-density plasmonic circuits.
This advancement contributes to the development of next-generation optical information processing technologies.