We report a leaky-mode resonant absorber fashioned as one-dimensional nanopatterned ultra-thin films. This simple structure exhibits optical absorbance of ∼66% in the 300–750 nm wavelength band, which is an ∼60% increase relative to a comparable planar reference structure. The transverse-magnetic (TM) polarized light in the ∼460–560 nm band is nearly totally absorbed. Applying a backside metal reflector raises the absorbance farther to ∼73%.
© 2012 Optical Society of America
Original Manuscript: November 23, 2011
Manuscript Accepted: April 10, 2012
Published: June 1, 2012
Wenhua Wu and Robert Magnusson, "Total absorption of TM polarized light in a 100 nm spectral band in a nanopatterned thin a-Si film," Opt. Lett. 37, 2103-2105 (2012)