Simultaneous Negative Phase and Group Velocity of Light in a Metamaterial
Karlsruhe Institute of Technology · Iowa State University · +3 more institutions
Abstract
We investigated the propagation of femtosecond laser pulses through a metamaterial that has a negative index of refraction for wavelengths around 1.5 micrometers. From the interference fringes of a Michelson interferometer with and without the sample, we directly inferred the phase time delay. From the pulse-envelope shift, we determined the group time delay. In a spectral region, phase and group velocity are negative simultaneously. This means that both the carrier wave and the pulse envelope peak of the output pulse appear at the rear side of the sample before their input pulse counterparts have entered the front side of the sample.
Citation impact
- FWCI
- 65.13
- Percentile
- 100%
- References
- 19
Authors
5- GDG. DollingCorresponding
Karlsruhe Institute of Technology, Iowa State University, Ames National Laboratory, Deutsche Forschungsgemeinschaft, Foundation for Research and Technology Hellas
- CEC. Enkrich
Karlsruhe Institute of Technology, Iowa State University, Ames National Laboratory, Deutsche Forschungsgemeinschaft, Foundation for Research and Technology Hellas
- MWMartin Wegener
Karlsruhe Institute of Technology, Iowa State University, Ames National Laboratory, Deutsche Forschungsgemeinschaft, Foundation for Research and Technology Hellas
- CMCostas M. Soukoulis
Karlsruhe Institute of Technology, Iowa State University, Ames National Laboratory, Deutsche Forschungsgemeinschaft, Foundation for Research and Technology Hellas
- SLStefan Lindén
Karlsruhe Institute of Technology, Iowa State University, Ames National Laboratory, Deutsche Forschungsgemeinschaft, Foundation for Research and Technology Hellas
Topics & keywords
- Group velocity
- Optics
- Group delay and phase delay
- Michelson interferometer
- Femtosecond
- Pulse (music)
- Phase (matter)
- Wavelength