Semiconductor Coherent Control
Final rept. 1 Jul 2001-31 Mar 2005
MASSACHUSETTS INST OF TECH CAMBRIDGE
Pagination or Media Count:
Ultrafast time-resolved spectroscopy and coherent control of terahenz phonon-polariton waves in semiconductors are explored, Phonon-polaritons are mixed lattice vibrationalelectromagnetic waves that move at light-like speeds through a host crystal, within which they may be used for ultrahigh-bandwidth modulation of optical or electrical properties and as high-speed information carriers. The development of a THz polaritonics platform for such applications is a main objective. The methods needed for coherent control over phonon-polantons were refined and exploited for modulation of semiconductor quantum dot and quantum well properties. The work involved spatial and temporal shaping of ultrafast optical fields that were used to generate correspondingly shaped THz fields. Spatiotemporal femtosecond pulse shaping was also extended to include both phase and amplitude profiles, permitting a wide range of important new applications including fully phase-coherent multidimensional spectroscopy, with full pulse shaping capabilities in all of the input light fields, conducted in a fully automated fashion. Spatiotemporal coherent control over THz phonon-polaritons was demonstrated in preliminary results, THz field effects on semiconductor quantum dot electronic properties are indicated. This opens the door to new understanding of quantum dot electronic dynamics and to applications involving THz-frequency modulation of optical gain and other properties of quantum dots.
- Electrical and Electronic Equipment
- Solid State Physics