Probing fundamental constant evolution with astronomical spectroscopy

Probing optical transitions in individual carbon nanotubes using polarized photocurrent spectroscopy.

Carbon nanotubes show vast potential to be used as building blocks for photodetection applications. However, measurements of fundamental optical properties, such as the absorption coefficient and the dielectric constant, have not been accurately performed on a single pristine carbon nanotube. Here we show polarization-dependent photocurrent spectroscopy, performed on a p-n junction in a single ...

X-Ray Astronomy to Resonant Theranostics for Cancer Treatment

Atomic spectroscopy is fundamental to study of astronomical objects for their formation, evolution, composition, physical conditions etc. Information are extracted from the spectral analysis of the electromagnetic radiation emitted by these objects. This article will focus on the study of X-ray radiation which is used as a powerful diagnostic for astrophysical plasmas, particularly those surrou...

Probing Galaxy evolution with Hi 21cm Absorption Spectroscopy

Ultrafast laser-probing spectroscopy for studying molecular structure of protein aggregates.

We report the development of a new technique to screen protein aggregation based on laser-probing spectroscopy with sub-picosecond resolution. Protein aggregation is an important topic for materials science, fundamental biology as well as clinical studies in neurodegenerative diseases and translation studies in biomaterials engineering. However, techniques to study protein aggregation and assem...

Origin and Evolution of Dust in Circumstellar and Interstellar Environments

Astronomical observations and analysis of stardust isolated from meteorites have revealed a highly diverse interstellar and circumstellar grain inventory, including both amorphous materials and highly crystalline compounds (oxides, silicates and carbonaceous). This dust is highly processed during its sojourn from its birthsite (stellar outflows and supernova explosions) to its incorporation int...