Accession Number:

ADP007876

Title:

Investigation of Carrier Transport in Photorefractive Superlattices by Time-Correlated Photon Counting,

Descriptive Note:

Corporate Author:

AT AND T BELL LABS MURRAY HILL NJ

Personal Author(s):

• Lacaita, Andrea
• Ralph, Stephen E.
• Capasso, Federico
• Malik, Roger J.

Report Date:

1992-05-22

Pagination or Media Count:

4.0

Abstract:

Recently a new class of photorefractive structures has been demonstrated. These devices rely on the spatial separation of photogenerated electrons and holes to produce a large refractive index modulation via the electro-optic effect and might have potential for all optical switching applications. One of these devices consists of an asymmetric 6-doped superlattice which is optically excited by a picosecond laser source. The resulting space charge field produced by charge separation creates a refractive index change of 3.8xl0-4 at a pump energy density of 40 fJum2. In this paper we report the first time-resolved studies of the carrier relaxation in these structures. The measurements were performed by a Time Correlated Photon Counting TCPC technique.

Descriptors:

• *OPTICAL SWITCHING
• *REFRACTION
• DENSITY
• ELECTRONS
• ENERGY
• INDEXES
• LASERS
• MEASUREMENT
• MODULATION
• OPTICS
• PHOTONS
• PUMPS
• REFRACTIVE INDEX
• RELAXATION
• SEPARATION
• SPACE CHARGE
• STRUCTURES
• SUPERLATTICES
• SWITCHING
• CHARGE CARRIERS
• TRANSPORT PROPERTIES
• ELECTROOPTICS

Subject Categories:

• Electrooptical and Optoelectronic Devices

Distribution Statement:

APPROVED FOR PUBLIC RELEASE