Surface plasmon polariton enhanced photoconductivity of tunnel junctions in the visible
- 1 April 1985
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 46 (7) , 626-628
- https://doi.org/10.1063/1.95507
Abstract
We have investigated the influence of surface plasmon polaritons (SPP’s) on the reflection spectra of Ag-Al2O2-Al and Al-AL2O2-Al junctions in the visible range. The SPP’s were excited via sinusoidal grating structures. The SPP photon coupling efficiency was optimized as a function of the grating modulation height and dielectric coatings. For optimum coupling conditions a narrowband photoresponse of up to 60 mV/W into a 100-Ω impedance at 632,8 nm was achieved. The narrowband (3–6 nm wide) photosignal is more than an order of magnitude higher than a broadband background signal. The color sensitivity is varied over the whole visible range with different dielectric coatings.Keywords
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