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MEMS optical scanners are highly desired due to their low-power, high-speed scanning. The in-plane vibratory grating scanner is a development in this area which possesses several unique features. The in-plane scanning minimizes the dynamic deformation, allowing for higher-resolution displays. The dispersive element permits splitting the incoming beam into its constituents for analysis and imaging. Coupling a grating platform to an in-plane moving structure is useful for real-time motion measurement which would otherwise be difficult to analyze. These applications are described including a recent development in the structural design of a double-layer layout which further improves the performance of the grating scanner.