Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Optical Polarization Anisotropy in Strained A Plane GaN Films on R Plane Sapphire
Date
2005-08-18
Author
Ghosh, Sandıp
Mısra, Pranob
Grahn, Holger T
İmer, Muhsine Bilge
Nakamura, Shujı
Denbaars, Steven P
Speck, James S
Metadata
Show full item record
Item Usage Stats
33
views
0
downloads
Cite This
We have investigated a [112¯0]-oriented A-plane GaN film on R-plane sapphire, where the c axis of GaN lies in the film plane, by polarized photoreflectance (PR) spectroscopy. Near the fundamental energy gap of GaN, the PR spectrum with the probe light polarized perpendicular to the c axis exhibits one feature corresponding to a single transition labeled T1. For a polarization parallel to c axis, two different features labeled T2 and T3 are observed at higher energies than the transition T1. In order to explain the origin of these three features, we compare the measured energies with calculations of the transition energies and oscillator strengths of the three band-to-band transitions of GaN near its fundamental gap for an anisotropic in-plane strain in the A plane. The analysis shows that the observed transition energies and polarization properties of the three transitions can be explained by the presence of an overall compressive, anisotropic in-plane strain in the film. The authors would like to thank O. Brandt for many useful discussions and M. Ramsteiner for the Raman measurements. One of the authors (S.G.) acknowledges the hospitality of the Paul Drude Institute during the course of this work.
URI
https://hdl.handle.net/11511/73749
Conference Name
6th International Conference on Nitride Semiconductors (ICNS), (29 Ağustos-02 Eylül 2005)
Collections
Department of Metallurgical and Materials Engineering, Conference / Seminar
Suggestions
OpenMETU
Core
Polarized photoreflectance spectroscopy of strained A-plane GaN films on R-plane sapphire
Ghosh, S; Misra, P; Grahn, HT; İmer, Muhsine Bilge; Nakamura, S; DenBaars, SP; Speck, JS (AIP Publishing, 2005-07-15)
We have investigated a [11 (2) over bar0]-oriented A-plane GaN film on R-plane sapphire, where the c axis of GaN lies in the film plane, by polarized photoreflectance (PR) spectroscopy. Near the fundamental energy gap of GaN, the PR spectrum with the probe light polarized perpendicular to the c axis exhibits one feature corresponding to a single transition labeled T-1. For a polarization parallel to c axis, two different features labeled T-2 and T-3 are observed at higher energies than the transition T-1. I...
Optical polarization anisotropy in strained A-plane GaN films on R-plane sapphire
Ghosh, Sandip; Misra, Pranob; Grahn, Holger T.; İmer, Muhsine Bilge; Nakamura, Shuji; DenBaars, Steven P.; Speck, James S. (Wiley, 2006-06-01)
We have used polarized photoreflectance (PR) spectroscopy to study [1120]-oriented A-plane GaN films on R-plane sapphire substrates. For this type of films, the c-axis of GaN lies in the film plane. When the probe beam is polarized perpendicular to the c-axis, we observe a single feature in the PR spectrum, while two features at higher energies are observed for parallel polarization. Comparing the transition energies with the ones obtained by electronic band-structure calculations, we identify the observed ...
Optical anisotropy in GaSe
Seyhan, A; Karabulut, O; Akınoğlu, Bülent Gültekin; Aslan, B; Turan, Raşit (Wiley, 2005-09-01)
Optical anisotropy of the layer semiconductor GaSe has been studied by photoluminescence (PL) and Fourier Transform Infrared Spectroscopy (FTIR). The PL spectra are dominated by two closely positioned emission bands resulting from the free exciton and the bound exciton connected direct band edge of GaSe. Photoluminescence and transmission spectra of GaSe crystals have been measured for two cases in which the propagation vector k is perpendicular (k perpendicular to c) and parallel to the c-axis (k//c). Peak...
Optical properties of TlGaSeS layered single crystals
Güler, Işıkhan; Hasanlı, Nızamı (2007-12-01)
The optical properties of TlGaSeS layered single crystals have been investigated by measuring the transmissions and the reflections in the wavelength region between 400 and 1100 nm. The optical indirect transitions with a band gap energy of 2.27 eV and direct transitions with a band gap energy of 2.58 eV were found by means of the analysis of the absorption data at the room temperature. The rate of change of the indirect band gap with temperature, that is, gamma = -3.2 x 10(-4) eV/K, was determined from the...
Optical and vibrational properties of nickel integrated germanium Zintl ion clusters
Ogun, Esra; Esentürk, Okan; Nalbant Esentürk, Emren (Elsevier BV, 2019-05-01)
Vibrational and optical properties of Ni-Ge clusters ([Ni2Ge9(PPh3)](2-), [Ni6Ge13(CO)(5)](4-)) have been investigated via UV-Vis, FTIR, and Fluorescence spectroscopies. Moreover, frequency and time-dependent (TD) electronic transition calculations have been performed to better characterize experimental findings, due to the scarcity of vibrational and optical spectroscopic studies on these type of clusters in the literature. UV-Vis spectroscopic analyses demonstrate a broad absorption band, with a maximum a...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
S. Ghosh et al., “Optical Polarization Anisotropy in Strained A Plane GaN Films on R Plane Sapphire,” presented at the 6th International Conference on Nitride Semiconductors (ICNS), (29 Ağustos-02 Eylül 2005), Bremen, Almanya, 2005, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/73749.