|
Layered van der Waals materials possess intriguing optical and electronic properties [1-3]. In particular, TMDCs near their excitonic resonance exhibit high index in the visible and near-infrared bands [4-6]. Moreover, hBN shows very large positive real material permittivity in the mid-infrared bands due to sharp phonon polaritonic resonance [7,8]. In this work, we explore the high refractive index photonics enabled by these materials. We examine light guiding performance in structures made of TMDCs and hBN at different wavelength ranges and find that due to their high index, it is possible to achieve efficient optical confinement within atomically thin channels.
[1] Manzeli, S., Ovchinnikov, D., Pasquier, D., Yazyev, O.V. and Kis, A., 2017. 2D transition metal dichalcogenides. Nature Reviews Materials, 2(8), pp.1-15.
[2] Wang, Q.H., Kalantar-Zadeh, K., Kis, A., Coleman, J.N. and Strano, M.S., 2012. Electronics and optoelectronics of two-dimensional transition metal dichalcogenides. Nature nanotechnology, 7(11), pp.699-712.
[3] Mak, K.F. and Shan, J., 2016. Photonics and optoelectronics of 2D semiconductor transition metal dichalcogenides. Nature Photonics, 10(4), pp.216-226.
[4] Morozov, Y. V.; Kuno, M. Optical Constants and Dynamic Conductivities of Single Layer MoS2, MoSe2, and WSe2. Appl. Phys. Lett. 2015, 107, 083103.
[5] A.; Hughes, H. Kramers-Kronig Analysis of the Reflectivity Spectra of 2H-MoS2, 2H-MoSe2 and 2H-MoTe2. J. Phys. C: Solid State Phys. 1979, 12, 881.
[6] R.; Baranov, D. G.; Munkhbat, B.; Cuadra, J.; Käll, M.; Shegai, T. Transition Metal Dichalcogenide Nanodisks as High-Index Dielectric Mie Nanoresonators. Nat. Nanotechnol. 2019, 14, 679-683.
[7] Tamagnone M, Ambrosio A, Chaudhary K, et al. Ultra-confined mid-infrared resonant phonon polaritons in van der Waals nanostructures[J]. Science advances, 2018, 4(6): eaat7189.
[8] A J, Dai S, Vurgaftman I, et al. Ultralow-loss polaritons in isotopically pure boron nitride[J]. Nature materials, 2018, 17(2): 134-139.
|
