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Specifically, we show that multiwavelength resonant modes with intensity enhancement exceeding three orders of magnitude are possible with w less then 30 nm and 300 nm less then d less then 900 nm for a range of fixed values of L. This study presents a novel paradigm of deep-subwavelength adiabatically-coupled width-graded gratings-illustrating its versatility in design, hence its viability for applications ranging from surface enhanced Raman spectroscopy to multispectral imaging.Alone among Western nations, the United States has a