科技报告详细信息
Millimeter- and submillimeter-wave nanoscience : LDRD project 122359 final report. | |
Lee, Mark | |
关键词: ELECTRODYNAMICS; OPTICAL MODES; PHONONS; SPECTRA; SPECTROSCOPY; TESTING Nanostructure materials.; Phonons-Optical properties.; Nanowires.; | |
DOI : 10.2172/942189 RP-ID : SAND2008-5940 PID : OSTI ID: 942189 Others : TRN: US0900418 |
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学科分类:物理(综合) | |
美国|英语 | |
来源: SciTech Connect | |
【 摘 要 】
LDRD Project 122359 was a nine-month, late-start effort that pursued initial experiments studying the fundamental electrodynamic response properties of various nanomaterials from millimeter-wave (above roughly 30 GHz) up to submillimeter-wave (above roughly 0.1 THz) frequencies. The nine months of this project's duration produced two main empirical findings. First, Fourier transform reflectance spectroscopy on SrTiO{sub 3} nanocrystals from 0.2 to 10 THz frequency showed signatures of two optical phonons that correspond to known optical modes in bulk crystal SrTiO{sub 3}. However, quantitative differences between the nanoparticle and bulk spectra suggest that one or both of these phonons may shift frequency and weaken in nanoparticles relative to bulk crystal. Second, heavily doped n-type GaAs nanowires were synthesized for the purpose of creating high frequency diodes to study non-linear frequency conversion properties of compound semiconductor nanowires. It was found that incorporation of a heavy concentration of dopants interferes with the growth of these nanowires. While DC measurements showed reasonable diode-like current-voltage properties, the current state-of-the-art material properties of these nanowires are still unsuitable for millimeter-wave testing and applications.【 预 览 】
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