Mr. Ahmed Sokar Profile

Ahmed Sokar

at Institut für Mikroelektronik Stuttgart

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Proceedings Article | 5 May 2015 Paper

Generation of red color and near infrared bandpass filters using nano-scale plasmonic structures

Ahmed Sokar, Franz Hutter, Joachim Burghartz

Proceedings Volume 9502, 95020U (2015) https://doi.org/10.1117/12.2179065

KEYWORDS: Aluminum, Metals, Silicon, Silica, Etching, Plasmonics, Cameras, Semiconducting wafers, Dielectrics, Optical filters

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Extraordinary/Enhanced optical transmission (EOT) is studied in the realization of plasmonic based filters in the visible range and near infrared spectrum for the purpose of substituting the Bayer-pattern filter with a new CMOS-compatible filter which can be easily tuned to provide different filter spectra. The filters studied in this paper are based on nano-structured 150nm thick Aluminum (Al) layer sandwiched between silicon dioxide (SiO₂) layers. The resonance wavelengths achieved by the filters are at 700nm and 950 nm. Three parameters are used for tuning the two filters, i.e., aperture area, the period, and the holes arrangement (square or rhombic lattice). The filter is based on the principle of surface plasmon polaritons (SPPs), where the electromagnetic waves of the incident light couples with the free charges of the metal at the metal-dielectric interface. EOT is observed when the metal is structured with apertures such as rectangular, circular, cross, bowtie, etc. The resonance frequency in that case depends on the shape of the aperture, material used, the size of the apertures, the period of the array, and the surrounding material. The fabricated two filters show EOT at wavelengths as designed and simulated with blueshift in the peak location.

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