Accession Number : ADA603598


Title :   Room Temperature Deposition Processes Mediated By Ultrafast Photo-Excited Hot Electrons


Descriptive Note : Final rept. 11 Feb 2013-10 May 2016


Corporate Author : VANDERBILT UNIV NASHVILLE TN


Personal Author(s) : Tolk, Norman ; Davidson, Jim ; Kang, Weng P ; Mu, Richard


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a603598.pdf


Report Date : 30 Jan 2014


Pagination or Media Count : 29


Abstract : The goal of the DARPA Local Control of Materials Synthesis (LoCo) program is to develop a generally applicable low-temperature process for the deposition of thin films, whose current minimum processing temperature exceeds the damage threshold temperatures of substrates of interest to the DoD. Early in the program, the representative thin film material was designated to be diamond. Conventional CVD diamond deposition requires temperatures greater than 700 0C, which results in severe degradation of many substrates of interest. To address this challenging scientific and technological problem, we have identified a novel approach. In this approach, wavelength specific, femtosecond laser pulses are used to control material processes, particularly growth processes, at the quantum level. Such an approach arises out of a focus on fundamental issues of non-equilibrium many-body physics that have been only recently addressed. We are pleased to report that our research team has exceeded the goals outlined for the first phase of the program and have demonstrated high-quality diamond growth at substantially lower temperatures. Our results demonstrate that this unique approach holds great promise for addressing and solving this important problem. Clearly, additional research needs to be carried out to facilitate further development and eventual implementation.


Descriptors :   *DEPOSITION , *ELECTRONS , *LOW TEMPERATURE , *ROOM TEMPERATURE , *THIN FILMS , DIAMONDS , GROWTH(GENERAL) , LASER BEAMS , SUBSTRATES


Subject Categories : Electrical and Electronic Equipment
      Nuclear Physics & Elementary Particle Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE