Accession Number : ADA321825

Title :   Spatial, Spectral and Temporal-Resolved Scanning Optical Microscope.

Descriptive Note : Final rept. 20 Jun 95-19 Dec 96,

Corporate Author : NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF PHYSICS

Personal Author(s) : Hallen, Hans D. ; Yakobson, Borris I.

PDF Url : ADA321825

Report Date : 17 FEB 1997

Pagination or Media Count : 12

Abstract : This instrumentation development project has made considerable progress towards its goals of producing a near field scanning optical microscope which tests the limits of spatial, temporal and spectral resolution, and which utilizes probes designed for optimal throughput and minimal probe heating. Specifically, (i) a Ti-sapphire laser has been constructed and successfully mode locked with fsec-scale pulses, (ii) a Raman detection system using a cooled CCD detector and a holographic filter has been configured, and (iii) several near-field instrument heads and electronics sub-systems built. The microscopes feature a novel constant linear motion coarse approach and improved probe-sample distance detection scheme developed under this project. A computer workstation has been purchased and programmed to (iv) model the images from the instrument in its time-resolved excess carrier studies mode, and to (v) perform ray tracing which has been used to suggest a novel rational probe design. Efforts are underway which utilize the instrument for sub psec time-resolved studies of excess carriers in silicon and to study near-field effects in Raman spectroscopy of KTP samples.

Descriptors :   *MICROSCOPES, *OPTICAL SCANNING, OPTIMIZATION, RAMAN SPECTROSCOPY, RAY TRACING, NEAR FIELD, MODE LOCKED LASERS, CHARGE COUPLED DEVICES.

Subject Categories : Optics
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE