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Diffraction gratings integrated with MEMS has many applications as they can offer shot noise limited sub-nm displacement detection sensitivities but are limited in range. A two-wavelength readout method is developed that maintains high sensitivity while increasing the detection range from 105nm to 1.7um assuming sensitivity is maintained at > 50% of the maximum sensitivity.
Pramod Rastogi, Rishikesh Dilip Kulkarni
Christian Depeursinge, Frédéric Montfort