Physikalisches Institut (PHI)

Cavity-enhanced spectroscopy of single-wall carbon nanotubes

Carbon nanotubes (CNTs) offer an intriguing combination of optical, electronic, and mechanical properties. We develop different techniques of cavity-enhanced spectroscopy to characterize individual CNTs. The figure shows exemplary spatially resolved, cavity-enhanced Raman spectroscopy to obtain spatial maps of molecular-fingerprint information (right image). At the same time, cavity-enhanced absorption microscopy allows us to quantitatively determine the extinction cross section (left image). Investigation of the details of Raman modes gives insight into electronic and structural properties. (Hümmer et al., Nature Commun. (2016)). In a different direction, localized excitons in CNTs can be useful as quantum light source. We work on the Purcell enhancement of telecom single photon emission from chemically functionalized CNTs.