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    DEMONSTRATION OF RESONANT ADAPTIVE MIRRORS
    (IEEE, 2021) Kamel, Amr; Kocer, Samed; Das, Taylan; Mukhangaliyeva, Lyazzat; Saritas, Resul; Hajireza, Parsin; Yavuz, Mustafa
    We present a novel continuous deformable mirror (DM). The mirror can be integrated into optical systems to compensate for multiple wavefront aberrations during real-time scanning of the human retina and other targets. Specifically, it can correct all seven of the wavefront aberrations dominant in ophthalmic applications. The mirror assumes the desired shape to correct an aberration via resonant electrostatic actuation. It eliminates the need for a large number of electrodes and dependence algorithm required for spatial control of segmented DMs. It also realizes an additional benefit of dynamic amplification, thereby increasing the stroke distance. In addition, we demonstrate that the fundamental (defocus) mode of the DM can be used to change the location of the focal point for a reflected laser beam by up to 485 mu m.
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    Öğe
    Long-Term Stability of Ferroelectret Energy Harvesters
    (MDPI, 2020) Kayaharman, Muhammed; Das, Taylan; Seviora, Gregory; Saritas, Resul; Abdel-Rahman, Eihab; Yavuz, Mustafa
    Cellular polypropylene (PP) has been recently used in energy harvesting applications. In this work, we investigate its viability and long-term stability under various operating conditions. Specifically, the effect of constant stress and stress cycling on output power and long-term stability of ferroelectret energy harvesters is analyzed. Our findings show that after 112 days constant stress significantly increases the piezoelectric charge constant d(33) and output power from 0.51 mu W for a stress-free harvester to 2.71 mu W. It also increases the harvester center frequency from 450 to 700 Hz and decreases its optimal resistance from 7 to 5.5 M Omega.