TY - JOUR
T1 - Ultrafast Tunable Broadband Optical Anisotropy in Two-Dimensional Re S2
AU - Seo, Sung Bok
AU - Nah, Sanghee
AU - Sajjad, Muhammad
AU - Singh, Nirpendra
AU - Shin, Youngwook
AU - Kim, Younghyun
AU - Kim, Jaekyun
AU - Sim, Sangwan
N1 - Funding Information:
S.B.S. and S.S. are supported by the National Research Foundation of Korea (NRF) through the government of Korea (MSIP) (Grant No. NRF-2022R1C1C1003124). This work is, in part, supported by the BK21 FOUR (Fostering Outstanding Universities for Research) funded by the Ministry of Education (MOE, Korea) and National Research Foundation of Korea. The transient absorption experiments are carried out with the Femtosecond Transient Absorption Microscopy (ST015) at the Korea Basic Science Institute (KBSI). S.N. is supported by the KBSI (Project No. C140640) and S.S. is supported by the KBSI under the R&D program (Project No. C030440) supervised by the Ministry of Science and ICT. The absorbance experiment is carried out with an ultrawide wavelength-range microspectrometer system at the Hanyang University ERICA. Y.S. is supported by “the Competency Development Program for Industry Specialists” of the Korean Ministry of Trade, Industry, and Energy (MOTIE), operated by the Korea Institute for Advancement of Technology (KIAT). (Grant No. P0002397, HRD program for Industrial Convergence of Wearable Smart Devices). M.S and N.S acknowledge financial support from the Abu Dhabi Department of Education and Knowledge (ADEK) under Grant No. AARE19-126 and support by the Khalifa University of Science and Technology. This research is supported by the Technology Innovation Program (Grant No. 20015909) through the Korea Evaluation Institute of Industrial Technology (KEIT), funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). This research was also supported by KBSI grant funded by Ministry of Education (2021R1A6C101A405).
Publisher Copyright:
© 2022 American Physical Society.
PY - 2022/7
Y1 - 2022/7
N2 - Anisotropic two-dimensional materials provide promising platforms for polarization-driven optoelectronic and photonic devices. In particular, layered rhenium disulfide (ReS2) has recently attracted intensive attention due to its unique linear dichroism. However, control over the optical properties of ReS2 is mostly limited to the band-edge excitons, which significantly limits the application wavelength range. Here, we utilize ultrafast transient absorption microscopy to tune the broadband optical anisotropy of few-layer ReS2. We observe a broad nonexcitonic photoinduced-Absorption feature, which exhibits weak anisotropy immediately after pump excitation, but, surprisingly, shows a strong polarization dependence after a few picoseconds, leading to a broadband enhancement in the optical anisotropy. We attribute this to carrier cooling and subsequent anisotropic free-carrier absorption due to anisotropic carrier effective masses. This work provides not only a principle for the ultrafast active control of broadband polarization-sensitive photonic devices but also insights into anisotropic carrier dynamics in two-dimensional materials.
AB - Anisotropic two-dimensional materials provide promising platforms for polarization-driven optoelectronic and photonic devices. In particular, layered rhenium disulfide (ReS2) has recently attracted intensive attention due to its unique linear dichroism. However, control over the optical properties of ReS2 is mostly limited to the band-edge excitons, which significantly limits the application wavelength range. Here, we utilize ultrafast transient absorption microscopy to tune the broadband optical anisotropy of few-layer ReS2. We observe a broad nonexcitonic photoinduced-Absorption feature, which exhibits weak anisotropy immediately after pump excitation, but, surprisingly, shows a strong polarization dependence after a few picoseconds, leading to a broadband enhancement in the optical anisotropy. We attribute this to carrier cooling and subsequent anisotropic free-carrier absorption due to anisotropic carrier effective masses. This work provides not only a principle for the ultrafast active control of broadband polarization-sensitive photonic devices but also insights into anisotropic carrier dynamics in two-dimensional materials.
UR - http://www.scopus.com/inward/record.url?scp=85134681399&partnerID=8YFLogxK
U2 - 10.1103/PhysRevApplied.18.014010
DO - 10.1103/PhysRevApplied.18.014010
M3 - Article
AN - SCOPUS:85134681399
SN - 2331-7019
VL - 18
JO - Physical Review Applied
JF - Physical Review Applied
IS - 1
M1 - 014010
ER -