Low power ultra-low voltage THz range detector circuit exploration for plasmonic wave computing

Leuven - PhD
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More than two weeks ago

By exploiting the non-linear behavior of transistors, operation above fmax becomes possible and high-speed circuits above 500GHz becomes feasible, but these concepts have never been transferred to the domain of ultra-high speed plasmonic wave computing.

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As VLSI device downscaling nears atomic dimensions, traditional charge-based devices face huge challenges. As a result, the last years have seen the advent of a surge in so-called beyond-CMOS device concepts which are mostly non-charge based. One of these promising directions is the plasmonic wave computing paradigm. In that case, the light waves traveling through a metal-insulator-metal waveguide can be exploited for highly parallel wave computing as long as the coherency is maintained. Furthermore, the inherent energy, efficiency and speed of these waveguides are excellent. This technology works with relatively large dimensions (50+ nm) so it is not based on advanced litho and process fabrication. A successful implementation of this paradigm however also requires an energy-efficient and fast (THz range) electronic interface circuit to bridge multiple of such plasmonic waveguides.

Several initial results at KU Leuven ESAT-MICAS clearly indicate to feasibility of using CMOS technology to generate and detect THz waves. By exploiting the non-linear behavior of transistors, operation above fmax becomes possible and several examples up to 600GHz have already been demonstrated in 28nm CMOS. This clearly indicates the potential of building such very high frequency circuits at reasonable power consumption. However, these concepts have never been transferred to the domain of plasmonic wave computing.

The aim of this PhD thesis will be threefold: i) investigate innovative THz circuits for interfacing with plasmonic waveguides, with the appropriate specifications derived from the existing waveguide designs, ii) explore and propose novel circuit extensions which allow to work at ultra-low voltages and ultra-low power, to achieve maximal energy efficiency iii) demonstrate these concepts in prototype silicon implementations. We will use commercial available technologies for the fabrication.

Required background: Electrical Engineering

Type of work: 40% modeling, 30% circuit design, 30% circuit implementation

Supervisor: Francky Catthoor

Daily advisor: Francky Catthoor

The reference code for this position is 2020-012. Mention this reference code on your application form.
Chinese nationals who wish to apply for the CSC scholarship, should use the following code when applying for this topic: CSC2020-62.

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