The absorption of Germanium (Ge) rises dramatically with decreased incident wavelength, in the absorption region of <1900nm, inversely no absorption of <1900nm, where the absorption would affect the measurement of refractive index. The band structure and optical properties of these crystals are calculated within the framework of density functional theory with local density approximation (DFT-LDA). The results show that the band gap is 0.571eV, which is closer to the experimental value as compared to Generalized Gradient Approximation (GGA) calculations. As the pressure increases from 0 to 2 GPa, restricted by experimental equipment, the indirect band gap increases linearly with the gradient of 4.29×10-2 eV/GPa and the refractive index reduces linearly with the gradient of 5.903×10-2 /GPa.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.