Accession Number:

AD1023969

Title:

Ultrafast Spectroscopic Noninvasive Probe of Vertical Carrier Transport in Heterostructure Devices (Second year of three year progress report)

Descriptive Note:

Technical Report

Corporate Author:

Army Research Laboratory (ARL) Adelphi United States

Personal Author(s):

• Metcalfe,Grace
• Connelly,Blair
• Svensson,Stefan

Report Date:

2014-10-01

Pagination or Media Count:

5.0

Abstract:

Optical-based approaches have the advantage of being noninvasive and nondestructive, and can usually be performed without modification to the sample. We propose to merge two ultrafast spectroscopy methods, pump-probe spectroscopy and time-domain THz spectroscopy TDTS, to realize a femtosecond-resolution double-pump-probe spectroscopy technique tunable from the visible through long-wave infrared LWIR wavelength range. Our approach allows us to examine not only the transient concentration due to an appropriate pump pulse, but also the time-resolved THz radiation induced by the probe pulse. By analyzing the resulting kinetic profiles, one can obtain critical information about the internal electric fields, radiative and non-radiative recombination rates, carrier drift and diffusion times, and electron and hole velocities.

Descriptors:

• semiconductors
• energy bands
• heterojunctions
• quantum electronics
• electro optics
• numerical aperture
• radiation
• solar cells
• spectroscopy
• time domain
• absorption
• quantum wells
• band gaps
• electric fields
• TRANSPORT PROPERTIES

Subject Categories:

• Electrooptical and Optoelectronic Devices

Distribution Statement:

APPROVED FOR PUBLIC RELEASE