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  • 1.
    Forsberg, Erik
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Reversible logic based on electron waveguide Y-branch switches2004In: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 15, no 4, p. S298-S302Article in journal (Refereed)
    Abstract [en]

    The lower bound of the energy required to change the state of an electron waveguide Y-branch switch is not thermally limited, and the theoretical limit is orders of magnitude lower than the energy cost of information erasure. Thus as the power dissipation due to information erasure can be avoided by the use of logically reversible gates, such gates based on electron waveguide Y-branch switches promise circuits with extremely low power dissipation. In this paper, reversible logic based on electron waveguide Y-branch switches is proposed and discussed.

  • 2.
    Forsberg, Erik
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    The electron waveguide Y-branch switch: A review and arguments for its use as a base for reversible logic2005In: CF '05 Proceedings of the 2nd conference on Computing frontiers, 2005, p. 404-406Conference paper (Refereed)
  • 3.
    Forsberg, Erik
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Hessmo, Björn
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Thylén, Lars
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Limits to modulation rates of electroabsorption modulators2004In: IEEE Journal of Quantum Electronics, ISSN 0018-9197, E-ISSN 1558-1713, Vol. 40, no 4, p. 400-405Article in journal (Refereed)
    Abstract [en]

    We analyze the speed limitations of optical electroabsorption modulators. We argue that modulation rate limits are closely related to quantum mechanical adiabaticity. By analyzing the breakdown of the adiabatic approximation, analytical expressions for modulation limits are found. These expressions are numerically validated. Furthermore, we discuss the constraints on the allowable modulation rate set by losses from the quantum well and transition linewidth.

  • 4.
    Forsberg, Erik
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Wesström, Jan Olof
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Self-consistent simulations of mesoscopic devices operating under a finite bias2004In: Solid-State Electronics, ISSN 0038-1101, E-ISSN 1879-2405, Vol. 48, no 7, p. 1147-1154Article in journal (Refereed)
    Abstract [en]

    A novel numerical algorithm based on the solution of the two-dimensional effective mass equation for current-carrying scattering states in mesoscopic devices is developed. Using this while allowing for an energy dependent transmission matrix, the total charge density distribution based on all electrons injected into the device is calculated through integration over energy. By coupling this energy-resolved calculation of charge density distribution iteratively with a potential calculation a fully self-consistent calculation, which allows for accurate simulations of mesoscopic devices with arbitrary complex device geometries operating under a finite bias, is achieved. Thus it is possible to self-consistently study space charge effects in mesoscopic devices. The developed method is described and tested on a number of sample geometries.

  • 5.
    Liu, Liu
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Han, Z.
    Forsberg, Erik
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Ultra-compact Directional Couplers and Mach-Zehnder Interferometers employing Surface Plasmon Polaritons2005In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 259, no 2, p. 690-695Article in journal (Refereed)
    Abstract [en]

    Optical directional couplers and Mach-Zehnder interferometers employing surface plasmon polaritons are proposed and their characteristics are analyzed numerically using a finite-difference time-domain method. It is shown that these devices can have transverse size smaller than the incident wavelength and can then be regarded as true subwavelength photonic elements. The ultra-compact characteristic of these devices can be utilized as a basis of next generation of integrated photonic circuits. Furthermore, calculations also show that these devices behave differently from their traditional all-dielectric counterparts. For the proposed optical directional coupler, the phase difference between the two output ports will no longer be 90 degrees even when the two ports have the same power outputs.

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