A. Maffucci

Università degli studi di Cassino e del Lazio Meridionale, Cassino, Latium, Italy

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Publications (97)51.44 Total impact

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    Antonio Maffucci
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    ABSTRACT: A new possible mechanism of signal detection in the THz range is investigated, based on the excitation of resonances due to the tunneling effect between two graphene nanoribbons. A simple detector is proposed, where two graphene nanoribbons are used to contact two copper electrodes. The terminal voltages are shown to exhibit strong resonances when the frequency of an external impinging field is tuned to the characteristic tunneling frequency of the graphene layer pair. An electrodynamic model for the electron transport along the graphene nanoribbons is extended here to include the tunneling effect, and a coupled transmission line model is finally derived. This model is able to predict not only the tunneling resonance, but also the well-known plasmon resonances, related to the propagation of slow surface waves.
    Preview · Article · Nov 2015 · Applied Sciences
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    ABSTRACT: The paper investigates two typical electromagnetic compatibility (EMC) problems, namely, coupling and matching in nanoscale circuits composed of nano-interconnects and quantum devices in entangled state. Nano-interconnects under consideration are implemented by using carbon nanotubes or metallic nanowires (NWs), while quantum devices by semiconductor quantum dots. Equivalent circuits of such nanocircuits contain additional elements arising at nanoscale due to quantum effects. As a result, the notions of coupling and impedance matching are reconsidered. Two examples are studied: in the first one, electromagnetically coupled NWs are connected to classical lumped devices; in the second one, electromagnetically uncoupled transmission lines are terminated on quantum devices in entangled states. In both circuits, the EMC features qualitatively and quantitatively differ from their classical analogs. In the second example, we demonstrate the existence of quantum coupling, due to the entanglement, which exists in spite of the absence of classical electromagnetic coupling. The entanglement also modifies the matching condition introducing a dependence of the optimal value of load impedance on the line length.
    Full-text · Article · Aug 2015 · IEEE Transactions on Electromagnetic Compatibility
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    ABSTRACT: We present a new concept of nano electromagnetic compatibility (EMC) for nanoelectronics, based on the synthesis of the classical electrodynamics and quantum transport theory in nanostructures. We demonstrate that classical EMC concepts such as coupling, shielding, and impedance matching, should be reconsidered taking into account quantum correlations and tunneling, as well as spin-spin and dipole-dipole interactions. As a result equivalent circuits will contain additional elements of quantum nature, which significantly influence the EMC. The main concept is illustrated by the example of carbon nanotube based interconnects. We also briefly discuss the major challenges in nanoEMC and its future perspectives. © 2014 The Institute of Electronics, Information and Communication Engineer.
    No preview · Article · Dec 2014 · IEEE International Symposium on Electromagnetic Compatibility
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    Antonio Maffucci · Giovanni Miano
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    ABSTRACT: A semi-classical electrodynamical model is derived to describe the electrical transport along graphene, based on the modified Boltzmann transport equation. The model is derived in the typical operating conditions predicted for future integrated circuits nano-interconnects, i.e., a low bias condition and an operating frequency up to 1 THz. A generalized non-local dispersive Ohm's law is derived, which can be regarded as the constitutive equation for the material. The behavior of the electrical conductivity is studied with reference to a 2D case (the infinite graphene layer) and a 1D case (the graphene nanoribbons). The modulation effects of the nanoribbons' size and chirality are highlighted, as well as the spatial dispersion introduced in the 2D case by the dyadic nature of the conductivity.
    Full-text · Article · Jun 2014 · Applied Sciences
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    ABSTRACT: The paper proposes a new approach to replace electrical interconnects embedded in inhomogeneous dielectrics with simplified equivalent homogeneous transmission lines. The procedure estimates the values of the equivalent per-unit-length parameters via homogenization of physical and geometrical parameters, such as permittivity and conductor inter-distance. The homogenization is carried out by exploiting the properties of an identification algorithm based on the monotonicity properties. A case-study is carried out, highlighting the main features of the method.
    No preview · Conference Paper · May 2014
  • A.G. Chiariello · Antonio Maffucci · Giovanni Miano
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    ABSTRACT: This paper proposes an equivalent circuital model to describe the electrical propagation along nanoscale interconnects, made either by carbon nanotubes or graphene nanoribbons. The circuital models are derived from an electrodynamical model for the transport of conduction electrons, and are expressed in the frame of the classical transmission line theory. The per-unit-length parameters, despite their simple expressions, retain the main phenomena occurring at nanoscale, such as the kinetic and quantum effects. In addition, the circuit parameters are expressed as functions of the temperature and the transverse size of the interconnect, thus allowing a qualitative and quantitative analysis of their impact in the electrical performance of the interconnects. The models are used to study some challenging problems in nanopackaging, such as the degradation of electrical performance due to self-heating and the high-frequency current crowding problem because of the skin-effect. Interconnects and vias are analyzed, referring to the 14-nm technology node.
    No preview · Article · Nov 2013 · IEEE Transactions on Components, Packaging, and Manufacturing Technology
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    Ramachandra Achar · Antonio Maffucci
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    ABSTRACT: The seven papers in this special section are updated and expanded versions of the papers that appeared in the IEEE CPMT-sponsored conferences: Electrical Performance of Electronic Packaging and Systems (EPEPS) 2011 and 2012, and Workshop on Signal and Power Integrity (SPI) 2011 and 2012.
    Preview · Article · Nov 2013 · IEEE Transactions on Components, Packaging, and Manufacturing Technology
  • Andrea G. Chiariello · Antonio Maffucci · Giovanni Miano
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    ABSTRACT: This paper investigates the electrical performance of innovative carbon‐based nano‐interconnects made by carbon nanotubes and graphene nanoribbons. The electronic transport in the carbon materials is modeled in the frame of the Transmission Line theory, where the classical per‐unit‐length circuital parameters are corrected by new terms arising from the quantistic nature of the transport. These parameters are related to the number of the conducting channels and the mean free path, which in turn, are expressed as functions of temperature and size. By coupling this model to the heat equation, a simple electro‐thermal model is derived. Case‐studies are carried out with reference to 22‐nm technology node applications. Copyright © 2013 John Wiley & Sons, Ltd.
    No preview · Article · Nov 2013 · International Journal of Numerical Modelling Electronic Networks Devices and Fields
  • Antonio Maffucci · Giovanni Miano
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    ABSTRACT: The paper deals with the electrodynamics of graphene nanoribbons in the low frequency regime where interband transitions are absent. The propagation of an electromagnetic signal along a single graphene nanoribbon is investigated by using the semi-classical Boltzmann equation. Eventually, a transmission-line model is proposed for nanoribbon interconnects and its main features are discussed.
    No preview · Article · Nov 2013 · Nanoscience and Nanotechnology Letters
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    Antonio Maffucci · Giovanni Miano
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    ABSTRACT: Nanowire-based circuits are candidates for future high-speed electronics. Signal propagation in nanowires can be studied by combining the semiclassical Boltzmann transport theory to the classical transmission line theory. In this paper, we apply this approach to model the signal propagation in graphene nanoribbon (GNR) interconnects. We express the kinetic inductance and the quantum capacitance in terms of the number of effective conducting channels. We study in detail the behavior of the number of effective conducting channels for both the armchair and zig-zag GNRs as their widths vary. This number is computed rigorously, taking into account the actual distribution of the energy spectrum and of the velocity of the conduction electrons. We found that the expressions for the number of conducting channels proposed in the literature give a significant overestimation of its values.
    Full-text · Article · Sep 2013 · IEEE Transactions on Nanotechnology
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    Ramachandra Achar · Antonio Maffucci
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    ABSTRACT: The seven papers in this special section are updated and expanded versions of the papers that appeared in the IEEE CPMT-sponsored conferences: Electrical Performance of Electronic Packaging and Systems (EPEPS) 2011 and 2012, and Workshop on Signal and Power Integrity (SPI) 2011 and 2012.
    Preview · Article · Jul 2013 · IEEE Transactions on Components, Packaging, and Manufacturing Technology
  • A. Maffucci · G. Miano
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    ABSTRACT: A simple but physically consistent model is presented to describe propagation of signals along interconnects made by graphene nanoribbons. The model is derived in the frame of the semi-classical theory. Its parameters are related to the effective number of conducting channels. Finally, a transmission line model is derived and the sensitivity of its parameters is analyzed with respect to the size and temperature change.
    No preview · Conference Paper · Jun 2013
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    ABSTRACT: The scope of this Minireview is to provide an overview of the recent progress on carbon nanotube electrodes applied to organic thin film transistors. After an introduction on the general aspects of the charge injection processes at various electrode-semiconductor interfaces, we discuss the great potential of carbon nanotube electrodes for organic thin film transistors and the recent achievements in the field.
    Full-text · Article · Apr 2013 · Nanoscale
  • A. Maffucci · G. Miano
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    ABSTRACT: This paper provides a transmission line (TL) model for the propagation of electric signals along graphene nanoribbon and carbon nanotubes interconnects in the sub-terahertz frequency range. The electrical parameters are written in terms of classical terms and quantum ones. The peculiar behavior of these parameters as a function of the transverse size and of the temperature is investigated, as well as the dispersion relation of the propagation velocity.
    No preview · Conference Paper · Jan 2013
  • A. Maffucci · G. Miano
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    ABSTRACT: A general transmission line model is presented, able to describe a large class of nano-interconnects, made either by conventional metallic nanowires or by innovative carbon materials (carbon nanotubes or graphene nanoribbons). A common frame is presented here, which allows describing the electrodynamics of such nano-structures by means of a modified Boltzmann transport equation. This model leads to a non-local dispersive Ohm's law, which is then coupled to Maxwell equations, to obtain the transmission line model. The quantum effects arising in nano-interconnects are included in the per-unit-length parameters of the transmission line model, so allowing the embedding of nano-interconnects into standard circuit simulators. The propagation properties of interconnects made by nanowires, carbon nanotubes and graphene nanoribbons are studied and a performance comparison is given, referring to the typical arrangements foreseen for the technology nodes of some nanometers.
    No preview · Conference Paper · Jan 2013
  • A. G. Chiariello · A. Maffucci · G. Miano
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    ABSTRACT: The paper investigates the Signal Integrity performance of innovative on-chip interconnects made by carbon-based materials, such as Carbon Nanotubes (CNTs) and Graphene NanoRibbons (GNRs). The innovative solutions are compared to the conventional copper realization. A simple but physically meaningful equivalent circuital model is presented for these interconnects, which properly accounts for the quantistic and kinetic phenomena observed at nanoscale. The models also include effects of interconnect size and temperature. Using this model, a Signal Integrity analysis of the electrical performance of global level on-chip interconnects is carried out, referring to the 22nm technology node.
    No preview · Article · May 2012
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    ABSTRACT: The electromagnetic behavior of multiwall carbon nanotubes (MWCNTs), in the frequency range where only intraband transitions are allowed, depends on the combinations of different aspects: the number of effective conducting channels of each shell, the electron tunneling between adjacent shells, and the electromagnetic interaction between shells and the environment. This paper proposes a general transmission-line (TL) model for describing the propagation of electric signals along MWCNTs at microwave through terahertz frequencies that takes into account all these aspects. The dependence of the number of conducting channels of the single shell on the shell chirality and radius is described in the framework of the quasi-classical transport theory. The description of the intershell tunneling effects on the longitudinal transport of the π-electrons is carried on the basis of the density matrix formalism and Liouville's equation. The electromagnetic coupling between the shells and ground plane is described in the frame of the classical TL theory. The intershell tunneling qualitatively changes the form of the TL equations through the tunneling inductance and capacitance operators, which have to be added, respectively, in series to the (kinetic and magnetic) inductance matrix and in parallel to the (quantum and electrical) capacitance matrix. For carbon nanotube (CNT) lengths greater than 500 nm, the norm of the tunneling inductance operator is greater than 60% of the norm of the total inductance in the frequency range from gigahertz to terahertz. The tunneling inductance is responsible for a considerable coupling between the shells and gives rise to strong spatial dispersion. The model has been used to analyze the eigenmodes of a double-wall CNT above a ground plane. The intershell tunneling gives arise to strong anomalous dispersion in antisymmetrical modes.
    Full-text · Article · May 2012 · IEEE Transactions on Nanotechnology
  • A. G. Chiariello · A. Maffucci
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    ABSTRACT: Inclusion of planar layered media Green's Functions (GFs) is a major issue in the computational efficiency of full-wave models derived from integral formulations. These GFs may be decomposed into quasi-dynamic and dynamic terms. In a wide range of practical applications, the quasi-dynamic terms may be given in closed form. This paper proposes two criteria to establish when the complete GFs may be approximated by the quasi-dynamic terms. These criteria are based on simple relations between frequency, line length, dielectric thickness and permittivity. If these criteria are satisfied, the inclusion of the GFs into full-wave integral models is straightforward and the overall computational cost is strongly reduced. The proposed criteria are verified through a benchmark test case. The model is then used to perform a full-wave analysis of the power lost in a microstrip, as a consequence of the excitation of parasitic modes, such as surface and leaky waves.
    No preview · Article · May 2012
  • Andrea G. Chiariello · Antonio Maffucci · Giovanni Miano
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    ABSTRACT: This paper investigates the electrical behavior of vias made by bundles of either single-walled or multiwalled carbon nanotubes (CNTs). The electronic transport in the CNTs is modeled through the kinetic inductance, the quantum capacitance, and the electrical resistance, which depend on the equivalent number of the CNT conducting channels. The dependence of such a number on the CNT radius, chirality, and temperature is described by using the quasi-classical transport theory. Since for the common mode the effects of the intershell tunneling are negligible, the interaction between different shells is described by using the classical electromagnetic theory. A simple but accurate equivalent lumped model for vias made by CNT bundles is proposed. Vias of interest in nanoelectronic applications are here analyzed, with particular focus on the behavior of electrical parameters versus temperature and frequency.
    No preview · Article · Feb 2012 · IEEE Transactions on Electromagnetic Compatibility
  • A.G. Chiariello · Antonio Maffucci · Giovanni Miano
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    ABSTRACT: The paper deals with the performance analysis of global-level on-chip interconnects. Two innovative solutions are presented, based on carbon solutions, and compared to conventional copper realization. These solutions involve the use of Carbon Nanotubes or Graphene Nanoribbons. A simple circuit equivalent model is presented for these interconnects, which can properly account for the geometrical properties of the carbon interconnects and for their temperature. Using this model, an analysis of the electrical performance of global level on-chip interconnects is carried out, referring to the 22nm technology node.
    No preview · Conference Paper · Jan 2012

Publication Stats

574 Citations
51.44 Total Impact Points

Institutions

  • 2003-2015
    • Università degli studi di Cassino e del Lazio Meridionale
      • • Department of Electrical and Information Engineering
      • • Department of Automation, Electromagnetism, Information Engineering and Industrial Mathematics - DAEIMI
      Cassino, Latium, Italy
  • 2014
    • INFN - Istituto Nazionale di Fisica Nucleare
      Frascati, Latium, Italy
  • 1997-2013
    • University of Naples Federico II
      • Department of Physical Sciences
      Napoli, Campania, Italy
  • 1999
    • Naples Eastern University
      • Dipartimento di Ingegneria Elettronica
      Napoli, Campania, Italy
  • 1998-1999
    • Policlinico Federico II di Napoli
      Napoli, Campania, Italy