TY - JOUR
T1 - Polarization Reflector/Color Filter at Visible Frequencies via Anisotropic α-MoO3
AU - Wei, Chenwei
AU - Abedini Dereshgi, Sina
AU - Song, Xianglian
AU - Murthy, Akshay
AU - Dravid, Vinayak P.
AU - Cao, Tun
AU - Aydin, Koray
N1 - Funding Information:
K.A. acknowledges support from the Office of Naval Research Young Investigator Program (ONR-YIP) Award (N00014-17-1-2425). The program manager is Brian Bennett. K.A. and V.P.D. acknowledge partial support from the Air Force Office of Scientific Research under Award Number FA9550-17-1-0348. This work was supported by the National Science Foundation under Grant Nos. DMR-1507810 and DMR-1929356. This work made use of the EPIC, Keck-II, SPID, and Northwestern University Micro/Nano Fabrication Facility (NUFAB) facilities of Northwestern University's NUANCE Center, which received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205); the MRSEC program (NSF DMR-1720319) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN. C.W. acknowledges support by China Scholarship Council (CSC). A.A.M. gratefully acknowledges support from the Ryan Fellowship and the IIN at Northwestern University.
PY - 2020/6/1
Y1 - 2020/6/1
N2 - 2D van der Waals materials have attracted increasing attention in recent years due to their exciting physical properties and offer new opportunities for creating devices with enhanced or novel functionalities. In particular, α-MoO3 is an emerging member of the fast-growing 2D family with strong natural anisotropic optical properties. However, anisotropic optical properties of -MoO3 in the visible frequency range remain elusive. Here, α-MoO3 is investigated as an optical material at the visible frequency (450–750 nm), which exhibits a polarization-dependent complex refractive index due to the anisotropic crystal structure. As a proof of concept, polarization-sensitive photonic devices including polarization reflectors and polarization color filters are designed and realized by constructing metal–insulator–metal Fabry–Perot cavities. It is observed that resonance frequencies for designed transmission and reflection filters change up to 25 nm with incident polarization which stems from the polarization-dependent complex refractive indices of α-MoO3. The largest contrasts are observed for two orthogonal polarization states parallel to the two orthogonal in-plane crystal directions. The approach in this study offers new directions for potential applications in the development of polarization-dependent devices based on 2D van der Waals materials for visible frequencies.
AB - 2D van der Waals materials have attracted increasing attention in recent years due to their exciting physical properties and offer new opportunities for creating devices with enhanced or novel functionalities. In particular, α-MoO3 is an emerging member of the fast-growing 2D family with strong natural anisotropic optical properties. However, anisotropic optical properties of -MoO3 in the visible frequency range remain elusive. Here, α-MoO3 is investigated as an optical material at the visible frequency (450–750 nm), which exhibits a polarization-dependent complex refractive index due to the anisotropic crystal structure. As a proof of concept, polarization-sensitive photonic devices including polarization reflectors and polarization color filters are designed and realized by constructing metal–insulator–metal Fabry–Perot cavities. It is observed that resonance frequencies for designed transmission and reflection filters change up to 25 nm with incident polarization which stems from the polarization-dependent complex refractive indices of α-MoO3. The largest contrasts are observed for two orthogonal polarization states parallel to the two orthogonal in-plane crystal directions. The approach in this study offers new directions for potential applications in the development of polarization-dependent devices based on 2D van der Waals materials for visible frequencies.
KW - metal–insulator–metal
KW - polarization color filters
KW - polarization reflectors
KW - α-MoO
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U2 - 10.1002/adom.202000088
DO - 10.1002/adom.202000088
M3 - Article
AN - SCOPUS:85082626815
VL - 8
JO - Advanced Optical Materials
JF - Advanced Optical Materials
SN - 2195-1071
IS - 11
M1 - 2000088
ER -