Emerging information technology and data deluge foster the unprecedented demands of higher chip density, clocking speed, data storage and lower power dissipation for on-chip non-volatile memories (NVMs). Here, two types of metal-insulator-metal (MIM) based NVM structures were fabricated and demonstrated involving controlled functionalization of molybdenum disulfide (MoS 2 ) and graphene oxide (GO) nanocomposite as a resistive switching layer. The first type of device constitutes Aluminum (Al) top and bottom electrode resulting in the Al/MoS 2 -GO/Al structure. While the second type of device uses Al top electrode and Indium Tin Oxide (ITO) bottom electrode resulting in Al/MoS 2 -GO/ITO. The current-voltage (I-V) characteristics for fabricated Al/MoS 2 -GO/Al and Al/MoS 2 -GO/ITO MIM structures exhibited considerable I ON /I OFF ratio of ∼10 2 (SET and RESET state at 0.5 V and −0.4 V) and ∼10 1 (SET and RESET state at 0.3 V and −1 V), respectively. The I-V characteristics for Al/MoS 2 -GO/Al MIM structure showed low voltage switching, substantial memory retention ∼10 4 s and endurance for up to 25 cycles. The low voltage and controlled switching operation for Al/MoS 2 -GO/Al MIM structures may be attributed to the presence of a large number of oxygen vacancies, defects in MoS 2 -GO, promoting enhanced charge hopping via interfacial oxide at MoS 2 -GO/Al interface as compared to MoS 2 -GO/ITO.
While the large design degrees of freedom (DOFs) give metasurfaces a tremendous versatility, they make the inverse design challenging. Metasurface designers mostly rely on simple shapes and ordered placements, which restricts the achievable performance. We report a deep learning based inverse design flow that enables a fuller exploitation of the meta-atom shape. Using a polygonal shape encoding that covers a broad gamut of lithographically realizable resonators, we demonstrate the inverse design of color filters in an amorphous silicon material platform. The inverse-designed transmission-mode color filter metasurfaces are experimentally realized and exhibit enhancement in the color gamut.
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