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Design Example: Capacitance Multiplier Circuit01:20

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
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Modular nonlinear hybrid plasmonic circuit.

Alessandro Tuniz1,2, Oliver Bickerton3, Fernando J Diaz3

  • 1Institute of Photonics and Optical Science, School of Physics, The University of Sydney, Sydney, NSW, 2006, Australia. alessandro.tuniz@sydney.edu.au.

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Researchers developed a modular method to create hybrid plasmonic integrated circuits (PICs) using silicon-on-insulator waveguides. This approach enhances light-matter interactions for advanced nanotechnology applications.

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Area of Science:

  • Nanotechnology
  • Photonics
  • Plasmonics

Background:

  • Photonic integrated circuits (PICs) are crucial for telecommunications, sensing, and quantum information.
  • Hybrid plasmonic elements can significantly boost PIC functionality but often require custom designs.
  • Current complex PIC designs typically necessitate ab initio (from scratch) design approaches.

Purpose of the Study:

  • To demonstrate a modular approach for creating hybrid plasmonic integrated circuits.
  • To post-process existing silicon-on-insulator (SOI) waveguides into functional plasmonic devices.
  • To integrate plasmonic rotators and nanofocussers for enhanced light manipulation.

Main Methods:

  • Utilizing off-the-shelf silicon-on-insulator (SOI) waveguides.
  • Implementing a modular design strategy for plasmonic components.
  • Characterizing the performance of integrated plasmonic rotators and nanofocussers.

Main Results:

  • Experimental demonstration of hybrid plasmonic integrated circuits.
  • Achieved intensity enhancements exceeding 200x.
  • Inferred mode area of 100 nm² at a 1320 nm pump wavelength.

Conclusions:

  • A modular approach enables practical hybrid plasmonic circuitry.
  • This method simplifies the integration of advanced plasmonic functionalities into PICs.
  • Facilitates broader applications of plasmonics in nanotechnology and integrated photonics.