Synchronized conductivity modulation to realize broadband lossless magnetic-free non-reciprocity.

Abstract:

:Recent research has explored the spatiotemporal modulation of permittivity to break Lorentz reciprocity in a manner compatible with integrated-circuit fabrication. However, permittivity modulation is inherently weak and accompanied by loss due to carrier injection, particularly at higher frequencies, resulting in large insertion loss, size, and/or narrow operation bandwidths. Here, we show that the presence of absorption in an integrated electronic circuit may be counter-intuitively used to our advantage to realize a new generation of magnet-free non-reciprocal components. We exploit the fact that conductivity in semiconductors provides a modulation index several orders of magnitude larger than permittivity. While directly associated with loss in static systems, we show that properly synchronized conductivity modulation enables loss-free, compact and extremely broadband non-reciprocity. We apply these concepts to obtain a wide range of responses, from isolation to gyration and circulation, and verify our findings by realizing a millimeter-wave (25 GHz) circulator fully integrated in complementary metal-oxide-semiconductor technology.Optical non-reciprocity achieved through refractive index modulation can have its challenges and limitations. Here, Dinc et al. introduce the concept of non-reciprocity based on synchronized spatio-temporal modulation of conductivity to achieve different types of non-reciprocal functionality.

journal_name

Nat Commun

journal_title

Nature communications

authors

Dinc T,Tymchenko M,Nagulu A,Sounas D,Alu A,Krishnaswamy H

doi

10.1038/s41467-017-00798-9

subject

Has Abstract

pub_date

2017-10-06 00:00:00

pages

795

issue

1

issn

2041-1723

pii

10.1038/s41467-017-00798-9

journal_volume

8

pub_type

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