TY - JOUR
T1 - Effect of optical waveguide on photoluminescence polarization in layered material GaSe with millimeter scale
AU - Suzuki, Masaki
AU - Kohda, Makoto
AU - Takasuna, Shoichi
AU - Matsuzaka, Shunichiro
AU - Sato, Yohei
AU - Tanabe, Tadao
AU - Oyama, Yutaka
AU - Nitta, Junsaku
N1 - Funding Information:
This work is partially supported by JSPS KAKENHI Grant Numbers 15H02099, 15H05854, 25220604, and 15H05699 and the EPSRC-JSPS Core-to-Core Program.
Publisher Copyright:
© 2018 The Japan Society of Applied Physics.
PY - 2018/2
Y1 - 2018/2
N2 - We investigate the photoluminescence (PL) polarization of millimeter-scale GaSe films with 100 nm and 150 μm thicknesses by excitation with linearly and circularly polarized light. Although free exciton emission predominates at 140 K, multiple peaks appear at 30 K owing to the recombination with impurity and/or localized states. Despite the circularly and linearly polarized excitations, the 100-nm-thick GaSe film constantly shows linear polarization in both band-edge and impurity/localized PLs. By rotating the sample geometry, the observed linear polarization is also rotated. This indicates that linear polarization is sensitive to the sample geometry and originates from the optical waveguide effect.
AB - We investigate the photoluminescence (PL) polarization of millimeter-scale GaSe films with 100 nm and 150 μm thicknesses by excitation with linearly and circularly polarized light. Although free exciton emission predominates at 140 K, multiple peaks appear at 30 K owing to the recombination with impurity and/or localized states. Despite the circularly and linearly polarized excitations, the 100-nm-thick GaSe film constantly shows linear polarization in both band-edge and impurity/localized PLs. By rotating the sample geometry, the observed linear polarization is also rotated. This indicates that linear polarization is sensitive to the sample geometry and originates from the optical waveguide effect.
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U2 - 10.7567/JJAP.57.020308
DO - 10.7567/JJAP.57.020308
M3 - Article
AN - SCOPUS:85042129050
VL - 57
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 2
M1 - 020308
ER -