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![Page 1: Nonlinear spectroscopy of planar and nano-crystalline silicon interfaces: experiments for ab initio theory Mike Downer, University of Texas at Austin,](https://reader036.fdocuments.us/reader036/viewer/2022062322/56649f285503460f94c3ff7e/html5/thumbnails/1.jpg)
Nonlinear spectroscopy of planar and nano-crystalline silicon interfaces: experiments for ab initio theory
Mike Downer, University of Texas at Austin, DMR-0207295Modern nano-scale devices contain such thin films or small particles of silicon that unusual bonding structures at the interfaces can dominate device properties. For example, interfacial Si=O double bonds and oxygen vacancies cause Si nano-crystals to luminesce brightly, unlike bulk Si. Full understanding of such nano-interfaces requires noninvasive probes such as optical second-harmonic generation that can measure the spectrum of these otherwise inaccessible buried interfaces. Here we show second-harmonic light generated at Si nano-interfaces emerging in a double-lobed transverse mode, as predicted by our theoretical collaborators.
Appl. Phys. Lett. 81, 3034 (2002)
Phys. Rev. Lett. 94, 047401 (2005)
TEM01 mode of second-harmonic lightgenerated at buried Si nano-interfaces
TEM00
mode ofincidentlaser
experiment theory
scanning electron micrograph of a
single Si nanocrystal
luminescence fromSi nano-composite
3 nm
![Page 2: Nonlinear spectroscopy of planar and nano-crystalline silicon interfaces: experiments for ab initio theory Mike Downer, University of Texas at Austin,](https://reader036.fdocuments.us/reader036/viewer/2022062322/56649f285503460f94c3ff7e/html5/thumbnails/2.jpg)
Education:Two REU undergraduates (Brian Mattern, James C. Miller) and four Ph.D. students (Ramon Carriles-Jaimes, Peter Figliozzi, Jinhee Kwon, Liangfeng Sun) are contributing to this work.
Outreach:PI Mike Downer lectures to students in the “Lasers & Optics” class of Prof. Dhiraj K. Sardar, winner of the 2003 APS prize for research at an undergraduate institution, at nearby UT-San Antonio.*
Nonlinear spectroscopy of planar and nano-crystalline silicon interfaces: experiments for ab initio theory
Mike Downer, University of Texas at Austin, DMR-0207295
Graduate student Jinhee Kwon (left) with our theory collaborator Bernardo Mendoza (right) of Centro de Investi-
gaciones en Optica (CIO), León, Méxicoat the 5th International Conference on
Optics of Surfaces & Interfaces in León,May 2003.
Graduate students Liangfeng Sun (left)
and Ramon Carriles-Jaimes
(right)
October 2004
* More than 56 percent of UTSA's students come from groups underrepresented in higher education. UTSA ranks 4th in thenation in number of undergraduate degrees to Hispanics.
![Page 3: Nonlinear spectroscopy of planar and nano-crystalline silicon interfaces: experiments for ab initio theory Mike Downer, University of Texas at Austin,](https://reader036.fdocuments.us/reader036/viewer/2022062322/56649f285503460f94c3ff7e/html5/thumbnails/3.jpg)
Nonlinear spectroscopy of planar and nano-crystalline silicon interfaces: experiments for ab initio theory
Mike Downer, University of Texas at Austin, DMR-0207295
Technician displaying a 12” waferat Sematech’s Austin, Texasfacility.
Industrial Liaison & Fund Leveraging:
In summer 2004, the PI was awarded a grantby Austin-based Sematech to characterizesilicon/high-K dielectric interfaces using the methods developed under this NSF project.
Grant Title: “Spectroscopic Methods for CharacterizingHigh-K dielectric films and Nanometer-Scale SiliconChannel Structures”
Grant amount: $100K Sematech liaison: Alain C. Diebold*
*editor of Handbook of Silicon Semiconductor Metrology (Marcel Dekker, 2001)