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American Physical Society March Meeting 2020

Denver Convention Center, Denver, Colorado

March 3, 2020 @ 11:15am in Room 404

Two-photon absorption spectroscopy and anisotropy of bulk zincblende and diamond symmetry semiconductors and quantum dots

Brandon J. Furey1, Rodrigo M. Barba-Barba2, Alan Bernal2, Tushti Shah1, Brian A. Korgel1, Ramon Carriles2, Bernardo S. Mendoza2, Michael C. Downer1

1University of Texas at Austin, 2Centro de Investigaciones en Optica, A.C. Leon, Mexico

Si quantum dots (SiQD) are potential candidates for biologically-inert theranostic applications. Excitation in the red-near infrared (NIR) by two-photon absorption (2PA) is useful for confocal microscopy and therapy techniques. We studied the spectroscopic response and size-dependence of 2PA in colloidal ligand-passivated SiQDs in the red-NIR by indirect two-photon induced photoluminescence (2PIP) and direct pump-probe modulation spectroscopy (PPMS). We are developing a model to explain the spectra for the nanocrystalline response from ab initio calculations using length gauge theory for bulk Si. We measured the 2PA spectra and anisotropies of bulk Si, GaAs, and GaP in the range 650-2000 nm using PPMS in the femtosecond excitation regime to further verify these calculations.

Ulises and I at the Mile High Stadium in Denver, CO after the APS March Meeting was cancelled

Session G27: Electronic Structure: Thermodynamic & Optical Properties
11:15 AM–2:15 PM, Tuesday, March 3, 2020
Room: 404

Sponsoring Unit: FIAP
Chair: James Heyman, Macalester Coll
Abstract: G27.00008 : Two-photon absorption spectroscopy and anisotropy of bulk zincblende and diamond symmetry semiconductors and quantum dots*

NOTE: THIS CONFERENCE WAS CANCELLED DUE TO THE NOVEL CORONAVIRUS 2019 PANDEMIC. THE CONFERENCE WAS MOVED ONLINE.

Link to presentation: http://absuploads.aps.org/presentation.cfm?pid=16488

Link to more information: http://meetings.aps.org/Meeting/MAR20/Session/G27.8