TY  - JOUR
A1  - Papke, Thomas
A1  - Yadavalli, Nataraja Sekhar
A1  - Henkel, Carsten
A1  - Santer, Svetlana
T1  - Mapping a plasmonic hologram with photosensitive polymer films: standing versus propagating waves
JF  - ACS applied materials & interfaces
N2  - We use a photosensitive layer containing azobenzene moieties to map near-field intensity patterns in the vicinity of nanogrids fabricated within a thin silver layer. It is known that azobenzene containing films deform permanently during irradiation, following the pattern of the field intensity. The photosensitive material reacts only to stationary waves whose intensity patterns do not change in time. In this study, we have found a periodic deformation above the silver film outside the nanostructure, even if the latter consists of just one groove. This is in contradiction to the widely accepted viewpoint that propagating surface plasmon modes dominate outside nanogrids. We explain our observation based on an electromagnetic hologram formed by the constructive interference between a propagating surface plasmon wave and the incident light. This hologram contains a stationary intensity and polarization grating that even appears in the absence of the polymer layer.
KW  - propagating surface plasmons
KW  - nanostructured metal surface
KW  - azobenzene containing photosensitive material
KW  - surface relief grating
Y1  - 2014
U6  - https://doi.org/10.1021/am503501y
SN  - 1944-8244
VL  - 6
IS  - 16
SP  - 14174
EP  - 14180
PB  - American Chemical Society
CY  - Washington
ER  -