AI Article Synopsis
- The study uses the finite difference time domain method to theoretically analyze how optical transmissions behave in compound gold slit arrays.
- Differences in transmission, reflection, and absorption are explored between bare slits and those with surface relief grating, revealing how variations in dielectric constants and slit widths affect the spectra.
- The introduction of different dielectrics in the slits causes red-shifts in plasmon resonances and notable dips in transmission spectra, attributed to Fabry-Pérot-like resonance and phase resonance mechanisms.
Article Abstract
The optical transmissions through compound gold surface relief slit arrays were investigated theoretically by using the finite difference time domain method. The differences of transmission, reflection, and absorption spectra of the bare slit and the surface relief grating are discussed. The transmission spectra influenced by different dielectric constants of medium in the two slits and different slits widths. When the two slits fill different dielectrics, the presence of the medium induces a red-shift of the plasmon resonances. Along with the dielectric constant in one slit increasing, there appear obvious dips in the transmission spectra. Based on the magnetic and electric field distributions, Fabry-Pérot-like resonance and phase resonance mechanisms have been suggested for the physical origins of these observations.
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| http://dx.doi.org/10.1364/OE.22.001085 | DOI Listing |
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