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2017 ; 7
(1
): 4171
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Effectively infinite optical path-length created using a simple cubic photonic
crystal for extreme light trapping
#MMPMID28646167
Frey BJ
; Kuang P
; Hsieh ML
; Jiang JH
; John S
; Lin SY
Sci Rep
2017[Jun]; 7
(1
): 4171
PMID28646167
show ga
A 900?nm thick TiO(2) simple cubic photonic crystal with lattice constant 450?nm
was fabricated and used to experimentally validate a newly-discovered mechanism
for extreme light-bending. Absorption enhancement was observed extending 1-2
orders of magnitude over that of a reference TiO(2) film. Several enhancement
peaks in the region from 600-950?nm were identified, which far exceed both the
ergodic fundamental limit and the limit based on surface-gratings, with some
peaks exceeding 100 times enhancement. These results are attributed to radically
sharp refraction where the optical path length approaches infinity due to the
Poynting vector lying nearly parallel to the photonic crystal interface. The
observed phenomena follow directly from the simple cubic symmetry of the photonic
crystal, and can be achieved by integrating the light-trapping architecture into
the absorbing volume. These results are not dependent on the material used, and
can be applied to any future light trapping applications such as
phosphor-converted white light generation, water-splitting, or thin-film solar
cells, where increased response in areas of weak absorption is desired.