In scanning near-field optical microscope, the optical resolution is determined by the actual size of the optical nano-antenna at the apex of the tip. In this talk, I will introduce our recent improvements in fabricating the ‘Campanile’ near-field Probe with the gap in a sub-20nm scale size. The near-field optical performance of the probe will be demonstrated through the polarization-resolved transmission measurement and the nano-photoluminescence mapping of the WSe2 monolayer.
Using time-resolved cathodoluminescence imaging, we measure the pixel-by-pixel cathodoluminescence decay of Mn2+ dopants in cesium lead chloride perovskite microplates. This measurement generates a spatially resolved map of the excited state decay dynamics of the Mn2+ dopants, which suggest an explanation for enhanced Mn2+ emission near the surface of the microplate. Near the surface, the contribution from the longer lifetime component increases, which implies that the population of excited Mn2+ is higher near the surface. This may arise due to the increased probability of carrier recombination at a Mn2+ dopant near the surface, possibly enabled by an increased concentration of traps.
Multiphoton tomography based on tunable femtosecond near infrared 80 MHz laser radiation has been used to map twophoton- excited time-resolved photoluminescence with picosecond temporal resolution from in-bulk thin photovoltaic layers. The time-resolved photoluminescence reflects carrier lifetimes and is therefore an important measure for the efficiency of a solar cell. Conventional one-photon solar cell characterization methods are dominated by surface effects and cannot provide information on subsurface carrier dynamics. In contrast, by using two-photon excitation, subsurface carrier dynamics can be monitored in 3D, providing morphological and spatial information on local defects and crystalline grain boundaries We present results on time-resolved photoluminescence and second harmonic generation imaging in forward and backward directions of CdTe/CdS films by time-resolved single photon counting and false-color photoluminescence mapping. High-resolution two-photon optical sectioning was carried out with a modified multiphoton FLIM tomograph MPTflex employing near-infrared sensitive photodetectors.
The demand for large area and low cost nanopatterning techniques for optical coatings and photonic devices has
increased at a tremendous rate. At present, it is clear that currently available nanopatterning technologies are unable to
meet the required performance, fabrication-speed, or cost criteria for many applications requiring large area and low cost
nanopatterning. Rolith Inc proposes to use a new nanolithography method - "Rolling mask" lithography - that combines
the best features of photolithography, soft lithography and roll-to-plate printing technologies. We will report on the first
results achieved on a recently built prototype tool and cylindrical mask, which was designed to pattern 300 mm wide
substrate areas.
We report the first experimental demonstration of far-field lensing using a plasmonic slit array. We implement a planar
nano-slit lens using a combination of thin film deposition and focused ion beam milling. Our lens structures consist of
optically thick gold films with micron-size arrays of closely-spaced, nanoscale slits of varying widths milled using a
focused ion beam. We demonstrate experimentally that it acts as a far-field cylindrical lens for light at optical
frequencies. We show excellent agreement between the full electromagnetic field simulations of the design, which
include both evanescent and propagating modes, and the far-field, diffraction-limited confocal measurements on
manufactured structures. The flexibility offered by these slit-based planar lenses allows for the design of microlenses
that compensate for oblique illumination in integrated opto-electronic systems, such as complementary metal-oxide
semiconductor (CMOS) image sensors.
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