The scattering of surface plasmon polariton (SPP) waves can be manipulated by various plasmonic structures. The plasmonic structure composed of arranged subwavelength nanobumps on a gold thin film is the promising structure to manipulation SPP wave. By controlling the geometric shape of the structures, the height, position, and pattern of scattered light from SPP wave can be modulated as desired. A clear single focusing spot can be reconstructed at a specific altitude by a particular curved structure with appropriate curvature and adjacent interspacing of nanobumps. The designed light patterns reconstructed by the focusing spot from the arranged curved structures at a specific observation plane are clearly demonstrated.
Confocal scanning laser ophthalmoscope (CSLO) has been established to be an important diagnostic tool for
retinopathies like age-related macular degeneration, glaucoma and diabetes. Compared to a confocal laser
scanning microscope, CSLO is also capable of providing optical sectioning on retina with the aid of a pinhole,
but the microscope objective is replaced by the optics of eye. Since optical spectrum is the fingerprint of local
chemical composition, it is attractive to incorporate spectral acquisition into CSLO. However, due to the
limitation of laser bandwidth and chromatic/geometric aberration, the scanning systems in current CSLO are
not compatible with spectral imaging. Here we demonstrate a spectral CSLO by combining a
diffraction-limited broadband scanning system and a supercontinuum laser source. Both optical sectioning
capability and sub-cellular resolution are demonstrated on zebrafish's retina. To our knowledge, it is also the
first time that CSLO is applied onto the study of fish vision. The versatile spectral CSLO system will be
useful to retinopathy diagnosis and neuroscience research.
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