Modulation spectroscopy enables the investigation of weak infrared radiation signals produced by sources with size is in the micrometer range. We have used this method first to investigate the thermal radiation from single subwavelength sized metallic or dielectric resonators. Next, we have adapted our setup to investigate the radiation from transistors made of graphene microstructures encapsulated in boron nitride (hBN). It is shown that the infrared emission from these devices exhibits features which are typical for electroluminescence and is concomitant with the occurrence of Zener Klein tunneling.
Time-resolved spectroscopy is performed in bulk samples of single wall carbon nanotubes. The carrier dynamics is monitored by probing the transient change of transmission of the sample in resonance with the interband transitions of the semiconducting tubes. Samples containing either isolated nanotubes or bundles of nanotubes are investigated. A strong increase of the relaxation time is observed for isolated nanotubes. We interpret this effect with a model based on a tunnel coupling between semiconducting and metallic nanotubes within a bundle. This model also accounts for the quenching of the luminescence in such samples.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.