Ultraviolet and solar-blind spectral imaging with subwavelength transmission gratings

Lim, S. H.; Yu, E. T.
October 2009
Applied Physics Letters;10/19/2009, Vol. 95 Issue 16, p161107
Academic Journal
Aluminum gratings with subwavelength slit widths were designed and analyzed for spectral filtering of ultraviolet (UV) light. Although schemes for optical wavelength filtering have been thoroughly studied, options for UV wavelength filtering are far more limited. We analyze the unique requirements for UV based imaging and evaluate the suitability of our structures by electromagnetic simulations and experimental measurements. Rayleigh–Wood anomalies are shown to lead to sharp drops in transmission at resonance wavelengths, producing a high finesse band reject filter. Finally, we show that the structures are effective for both TE and TM polarizations and easily integrated onto semiconductor photodetectors.


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