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Ultrathin Circular Polarimeter Based on Chiral Plasmonic Metasurface and Monolayer MoSe2
摘要： Two-dimensional materials are ideal platforms for intriguing physics and optoelectronic applications because of their ultrathin thicknesses and excellent properties in optics and electronics. Further studies on enhancing the interaction between light and two-dimensional materials by combining metallic nanostructures have generated broad interests in recent years, such as enhanced photoluminescence, strong coupling and functional optoelectronics. In this work, an ultrathin circular polarimeter consisting of chiral plasmonic metasurface and monolayer semiconductor is proposed to detect light with different circular polarization within a compact device. A designed chiral plasmonic metasurface with sub-wavelength thickness is integrated with monolayer MoSe2, and the circular-polarization-dependent photocurrent responses of right and left circularly polarized light for both left- and right-handed metasurfaces are experimentally demonstrated. The photoresponse circular dichroism is also obtained, which further indicates the remarkable performance of the proposed device in detecting and distinguishing circularly polarized light. This design offers a great potential to realize multifunctional measurements in an ultrathin and ultracompact two-dimensional device for future integrated optics and optoelectronic applications with circularly polarized light.
关键词： circular polarimeter,chiral plasmonic metasurface,MoSe2,photocurrent responses,two-dimensional materials
更新于2025-09-23 15:21:01
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2-D Silver-thiocyanate Layers Directed by Viologens: Structural Transformations upon Low Pressure Stimuli, Piezochromic Luminescence, Photocurrent Responses and Photocatalytic Properties
摘要： The reactions of AgSCN with excess KSCN in presence of linear viologens templates afford seven new hybrids, {(MV)[Ag4(SCN)6]}n (1), {(MV)[Ag2(SCN)4]}n (2), {(EV)[Ag4(SCN)6]}n (3), {(EV)[Ag2(SCN)4]}n (4), {(BV)[Ag4(SCN)6]}n (5), {(CMV)[Ag2(SCN)4]}n (6) and {(BMPE)[Ag2(SCN)4]}n (7), (MV2+=methyl viologen, EV2+=ethyl viologen, BV2+=benzyl viologen, CMV2+=cyanomethyl viologen, BMPE2+=1,2-bis(N-methylpyridiniim-4-yl)ethane). The silver-thiocyanate skeletons with formula of [Ag4(SCN)6]n 2n- and [Ag2(SCN)4]n 2n- are the scarce representative examples of the 2-D polypseudorotaxane arrays penetrated (for 1-6) or intercalated (for 7) by viologen dications. Upon the external low pressure stimulus, the 2-D silver-thiocyanate layers penetrated by cations exhibit loser packing with longer Ag-S(N) bond lengths, weaker CT interactions and larger cavities, but the contrary trend can be found on compound with intercalated organic cations. Due to the strong CT interactions between viologens and silver-thiocyanate skeletons, the charge transfers can occur at room temperature. Interestingly, 7 represents typical reversible piezochromic luminescence behaviour. In addition, they show excellent photocurrent responses and efficient photocatalytic degeneration performances on organic dyes. Finally, their band structures and density of states before and after compression based on DFT calculations were executed to correlate their properties.
关键词： Piezochromic Luminescence,Viologens,Silver-thiocyanate,Photocurrent Responses,Photocatalytic Properties,Structural Transformations
更新于2025-09-10 09:29:36