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Role of photo-assisted tunneling in time-dependent second-harmonic generation from Si surfaces with ultrathin oxides
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10.1063/1.4790389
/content/aip/journal/apl/102/5/10.1063/1.4790389
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/5/10.1063/1.4790389

Figures

Image of FIG. 1.
FIG. 1.

Measured TD-SHG signals on the 3.5 nm oxide Si sample in air and in N2 without pump exposure history (none) and the signals in air following 500 s prior exposure to different pump light of 3ω + ω, 3ω, 2ω + ω, and ω. The + sign corresponds to the combined pump of the UV lamp and the CW laser. Lines are fits to Eq. (1) .

Image of FIG. 2.
FIG. 2.

TD-SHG signals consecutively measured on the 3.5 nm oxide Si in different time stages. In stage I, TD-SHG is measured on a fresh sample. Then, the laser is blocked and TD-SHG stops. In stage II, TD-SHG resumes. Then, the laser is blocked and the sample surface is wiped by methanol lens tissue. In stage III, TD-SHG resumes again. Lines are fits to Eq. (1) .

Image of FIG. 3.
FIG. 3.

Measured TD-SHG signals on the 1.5 nm oxide Si in air without pump exposure history (none) and with prior exposure for 500 s to different pump light of 3ω + ω, 3ω, 2ω + ω, 2ω, and ω. The + sign corresponds to the combined pump of the UV lamp and the CW laser. The inset shows the starting SH signals following exposure to different pumps. Lines are fits to Eq. (1) .

Image of FIG. 4.
FIG. 4.

TD-SHG signals consecutively measured on the 1.5 nm oxide Si in different time stages. In stage I, TD-SHG is measured on a fresh sample. Then, the laser is blocked and TD-SHG stops. In stage II, TD-SHG resumes. Then, the laser is blocked and the sample surface is wiped by methanol lens tissue. In stage III, TD-SHG resumes. Then, the laser is blocked but the 3ω pump is exposed to the sample for 400 s. In stage IV, TD-SHG resumes again. Lines are fits to Eq. (1) .

Tables

Generic image for table
Table I.

Calculated electron densities from ω and 2ω photo-assisted tunneling for d = 3.5 nm and 1.5 nm.

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/content/aip/journal/apl/102/5/10.1063/1.4790389
2013-02-04
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Role of photo-assisted tunneling in time-dependent second-harmonic generation from Si surfaces with ultrathin oxides
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/5/10.1063/1.4790389
10.1063/1.4790389
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