All Optical Metamaterial Circuit Board at the Nanoscale

Department of Electrical and Systems Engineering, University of Pennsylvania, 200 South 33rd Street, ESE 203 Moore, Philadelphia, Pennsylvania 19103, USA.
Physical Review Letters (Impact Factor: 7.51). 10/2009; 103(14):143902. DOI: 10.1103/PhysRevLett.103.143902
Source: PubMed


Optical nanocircuits may pave the way to transformative advancements in nanoscale communications. We introduce here the concept of an optical nanocircuit board, constituted of a layered metamaterial structure with low effective permittivity, over which specific traces that channel the optical displacement current may be carved out, allowing the optical "local connection" among "nonlocal" distant nanocircuit elements. This may provide "printed" nanocircuits, realizing an all-optical nanocircuit board over which specific grooves may be nanoimprinted within the realms of current nanotechnology.

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    • "Inherent losses of optical materials behave within this paradigm as nanoresistors. The connections and coupling among nanocircuit elements has been investigated more closely in [17]–[21], leading to the concept of a full optical nanocircuit board [22]. Application of these ideas have been considered in recent years to realize optical sub-diffractive waveguides [23]–[25] and nanowires [26] or to load optical nanoantennas [27]–[30]. "
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    ABSTRACT: We apply the optical nanocircuit concepts to model and design optical nanofilters in realistic plasmonic waveguides of different nature, including strips and groove waveguides. The nanocircuit elements are designed to fit the waveguide geometry, and its equivalent impedance is analytically calculated by substituting the role of the conduction current with displacement current. The effect of plasmonic waveguide walls is rigorously modeled in terms of an extra nanocircuit loading that is included in our model. We show via numerical results that the nanocircuit approach may be effectively applied to the design of nanofilters, analogous to familiar concepts at radio-frequencies.
    IEEE Transactions on Antennas and Propagation 09/2012; 60(9):4381-4390. DOI:10.1109/TAP.2012.2207065 · 2.18 Impact Factor
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    ABSTRACT: A #-shaped gold wires metamaterial is designed for surface enhanced Raman spectroscopy (SERS) and sensing. The tunability of surface plasmon resonance (SPR) excitations, hotspots distribution, localized field enhancement and sensitivity of the structure are investigated. In contrast to most metamaterial, the #-shaped structure exhibits two pronounced SPRs that are insensitive to the polarization of excitation light. Pure electromagnetic Raman enhancement factors of about 10(6) are achieved on the symmetrically distributed field hotspots. It is possible to break the usable wavelength range of conventional gold SERS substrates via higher order excitations of the #-shaped metamaterial. In addition, the sensitivity and the figure of merits are found to be comparable or even higher than those of conventional SERS substrates. All these factors together with the high reproducibility nature of metamaterial and its simple planer structure suggest that this structure is very promising for surface enhanced spectroscopy and sensing applications.
    Optics Express 11/2009; 17(24):21843-9. DOI:10.1364/OE.17.021843 · 3.49 Impact Factor
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    ABSTRACT: The coupling behavior between two parallel micro/nano-fibers is investigated by extending the theory of transmission-lines (TL) to optical domain, Simulation result indicates that the energy transfer length of micro/nano-fibers based coupler is much shorter than that of conventional fiber based coupler. The experiment of the coupling behavior of micro/nano-fibers is demonstrated. It verifies the TL model of micro/nano-fiber coupler. This result may offer valuable reference for the investigation of nano-photonic devices.
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