Conductivity of nanoporous InP membranes investigated using terahertz spectroscopy
- Resource Type
- Conference
- Authors
- Merchant, S. K. E.; Lloyd-Hughes, J.; Sirbu, L.; Tiginyanu, I. M.; Parkinson, P.; Herz, L. M.; Johnston, M. B.
- Source
- 2007 Joint 32nd International Conference on Infrared and Millimeter Waves and the 15th International Conference on Terahertz Electronics Infrared and Millimeter Waves, 2007 and the 2007 15th International Conference on Terahertz Electronics. IRMMW-THz. Joint 32nd International Conference on. :224-225 Sep, 2007
- Subject
- Fields, Waves and Electromagnetics
Components, Circuits, Devices and Systems
Conductivity
Nanoporous materials
Indium phosphide
Biomembranes
Spectroscopy
Time domain analysis
Electrons
Frequency
Data mining
Optical sensors
- Language
- ISSN
- 2162-2027
2162-2035
We have investigated the conductivity of equilibrium and photoexcited electrons in nanoporous indium phosphide (InP) of various porosities and of two orientations: (100) and (111). We observed an enhanced transmission through the nanoporous samples compared with bulk InP, resulting from a suppression of the conductivity by the pores. The frequencydependent conductivity was extracted numerically from the transmission data. We examined the dynamical conductivity of photoexcited carriers using optical-pump THz-probe spectroscopy. After the rapid photoexcitation of electrons, the timeresolved conductivity was observed to decay slowly, with carrier recombination lifetimes exceeding 1 ns for all (100)- and (111)-oriented samples.