Article

The Promise of Plasmonics

California Institute of Technology, USA.
Scientific American (Impact Factor: 1.07). 05/2007; 296(4):56-63. DOI: 10.1145/1859855.1859856
Source: PubMed

ABSTRACT

Light is a wonderful medium for carrying information. Optical fibers now span the globe, guiding light signals that convey voluminous streams of voice communications and vast amounts of data. This gargantuan capacity has led some researchers to prophesy that photonic devices--which channel and manipulate visible light and other electromagnetic waves--could someday replace electronic circuits in microprocessors and other computer chips. Unfortunately, the size and performance of photonic devices are constrained by the diffraction limit; because of interference between closely spaced light waves, the width of an optical fiber carrying them must be at least half the light's wavelength inside the material. For chip-based optical signals, which will most likely employ near-infrared wavelengths of about 1,500 nanometers (billionths of a meter), the minimum width is much larger than the smallest electronic devices currently in use; some transistors in silicon integrated circuits, for instance, have features smaller than 100 nanometers.

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    • "he use of metallic cavities is a possible way of further miniaturizing lasers, which until now has received little attention [1]. The coupling of radiative emitters to the surfacebound electromagnetic waves supported by metals (surface plasmons) is an important topic in nano-optics [2]. Room temperature lasing of optically pumped semiconductor metallic nano-lasers has also been presented [3]. "

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    • "Electromagnetic (EM) wave scattering of random microstructures occurs in a wide range of applications. For example, the interaction of light with surface plasmons on roughened metallic surfaces produces surface plasmon polaritons (SPP) [2] [13], which has important applications in solar cells [3], meta-materials, and super-resolution imaging devices [12] [6]. Also, surface enhanced Raman scattering (SERS) [14] is closely related to the excitation of surface plasmons on rough or nano-pattern surfaces by incident light and is a very useful tool in finger-printing chemical components of a molecule, single molecule detector, DNA detection, and bio-sensor, etc [7]. "
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    ABSTRACT: In this paper, we develop an accurate and efficient Nystr\"{o}m volume integral equation (VIE) method for the Maxwell equations for large number of 3-D scatterers. The Cauchy Principal Values that arise from the VIE are computed accurately using a finite size exclusion volume together with explicit correction integrals consisting of removable singularities. Also, the hyper-singular integrals are computed using interpolated quadrature formulae with tensor-product quadrature nodes for several objects, such as cubes and spheres, that are frequently encountered in the design of meta-materials . The resulting Nystr\"{o}m VIE method is shown to have high accuracy with a minimum number of collocation points and demonstrate $p$-convergence for computing the electromagnetic scattering of these objects. Numerical calculations of multiple scatterers of cubic and spherical shapes validate the efficiency and accuracy of the proposed method.
    Full-text · Article · Oct 2015
    • "he use of metallic cavities is a possible way of further miniaturizing lasers, which until now has received little attention [1]. The coupling of radiative emitters to the surfacebound electromagnetic waves supported by metals (surface plasmons) is an important topic in nano-optics [2]. Room temperature lasing of optically pumped semiconductor metallic nano-lasers has also been presented [3]. "
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    ABSTRACT: Micro-active medium) MSI (" Metal thin Silver film / p-Si<100>/ Glass " cavity was designed for micro and nano laser systems, based on ~120 nm metal thin Ag film in thickness, p-Si<100>and Glass 0.5 mm in thickness making cavity of material matrix " MSI ". We have shown for the first time strong lasing in visible region " ~625nm " from simple material cavity " MSI " after interaction with " Ar+ ion laser, 514.5 nm: 0.7-0.8 watt " at room temperature. Si type was selected after PL study using He-Ne laser " 543.5nm " and Ar+ ion laser " 514.5 " nm .We have obtained excellent results from PL study after thermal treated p-Si<100>. In this work, we discuss the origin of this lasing and explain the relationship between the surface texture of Si and output intensity of lasing action at red emission. We have found there is strong relationship between excitation power and Δν FWHM of " MSI " matrix emission at room temperature.
    No preview · Article · Apr 2015
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