Oliver Kiowski

Er doped As 2 S 3 photoresist for 3-D direct laser fabrication of 3-D nanostructures

We present a novel high-index-of-refraction (2.45) photoresist material based on erbium doped arsenic trisulfide. It shows room temperature photoluminescence at 1.5 microns wavelength, and can directly be used for direct laser writing.

Detection Of Single Carbon Nanotubes in Aqueous Dispersion via Photoluminescence

We report on the ‘on‐line’ photoluminescence (PL) detection of individual single‐walled carbon nanotubes (SWNTs) in water‐surfactant dispersions. This was achieved by using a near‐infrared confocal laser luminescence microscope specially optimized for the PL spectroscopy of SWNTs . A detection of single nanotubes was possible by using dispersions with a relatively low concentration of nanotubes and reducing the PL acquisition time so that a ‘switch‐on‐switch‐off’ behavior of emission peaks was observed, which reflected a random diffusion of different nanotubes through the laser focus volume. These results demonstrate the analytical potential of PL spectroscopy using SWNTs as luminescent markers.

Interband Transition Energy Shifts in Photoluminescence of Single‐Walled Carbon Nanotubes under Hydrostatic Pressure

Photoluminescence (PL) spectroscopy was applied to determine shifts of electronic interband transition energies, E11 and E22, of semiconducting single‐walled carbon nanotubes (SWNTs) under hydrostatic pressure of several kbar in a diamond anvil cell. Our results show that the energy shifts depend not only on the (n,m) structure (helicity) of nanotubes, but also on nanotube aggregation and interaction with the surrounding medium. The latter factors are also affected by application of pressure. This can explain a discrepancy between the experimental data and theoretical predictions for ‘ideal’ (non‐interacting) SWNTs under hydrostatic pressure deformation.Photoluminescence (PL) spectroscopy was applied to determine shifts of electronic interband transition energies, E11 and E22, of semiconducting single‐walled carbon nanotubes (SWNTs) under hydrostatic pressure of several kbar in a diamond anvil cell. Our results show that the energy shifts depend not only on the (n,m) structure (helicity) of nanotubes, but also on nanotube aggregation and interaction with the surrounding medium. The latter factors are also affected by application of pressure. This can explain a discrepancy between the experimental data and theoretical predictions for ‘ideal’ (non‐interacting) SWNTs under hydrostatic pressure deformation.