Substrate-integrated photonic doping for near-zero-index devices

Ziheng Zhou, Yue Li (), Hao Li, Wangyu Sun, Iñigo Liberal and Nader Engheta ()
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Ziheng Zhou: Tsinghua University
Yue Li: Tsinghua University
Hao Li: Tsinghua University
Wangyu Sun: Tsinghua University
Iñigo Liberal: Public University of Navarre
Nader Engheta: University of Pennsylvania

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Near-zero-index (NZI) media, a medium with near zero permittivity and/or permeability, exhibits unique wave phenomena and exciting potential for multiple applications. However, previous proof-of-concept realizations of NZI media based on bulky and expensive platforms are not easily compatible with low-cost and miniaturization demands. Here, we propose the method of substrate-integrated (SI) photonic doping, enabling the implementation of NZI media within a printed circuit board (PCB) integrated design. Additionally, the profile of the NZI device is reduced by half by using symmetries. We validate the concept experimentally by demonstrating NZI supercoupling in straight and curve substrate integrated waveguides, also validating properties of position-independent photonic doping, zero-phase advance and finite group delay. Based on this platform, we propose design of three NZI devices: a high-sensitivity dielectric sensor, an efficient acousto-microwave modulator, and an arbitrarily-curved ‘electric fiber’. Our results represent an important step forward in the development of NZI technologies for microwave/terahertz applications.

Date: 2019
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DOI: 10.1038/s41467-019-12083-y

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