Dr. Ganesh Shimoga Profile

Dr. Ganesh Shimoga

at Korea University of Technology and Education

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Proceedings Article | 24 April 2020 Presentation

Transparent and soft vibrotactile actuator array based on dielectric elastomer for smart vehicle (Conference Presentation)

Seok-Han Lee, Dong-Soo Choi, Ganesh Shimoga, Sang-Youn Kim

Proceedings Volume 11378, 113780H (2020) https://doi.org/10.1117/12.2563416

KEYWORDS: Actuators, Dielectrics, Data centers

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In this contribution, we report on the development of transparent and soft vibrotactile actuator array that can be utilized in the next-generation touch display panels. Explicitly, we believe that the actuator array can more efficiently be employed in rollable smart windows of a smart vehicle. The proposed actuator array mainly composed of dielectric elastomer layer and ionic conductors. In order to construct the proposed vibrotactile actuator array, the dielectric elastomer is sandwiched between two soft ionic hydrogels. The ionic hydrogels contract each other under the applied electric field because of electrostatic attraction. As a result, the dielectric elastomer is compressed in its thickness direction and expanded to the out-of-plane direction. When the applied electric field is removed, the dielectric elastomer and ionic conductors are recovered to its initial state by elastic restoring force. When the alternating electric signal is applied to this structure, it generates vibration. To construct 4 × 4 vibrotactile actuator array, four perpendicular stripes and four longitudinal stripes made of ionic conductors were put on/under the planar dielectric elastomer. The proposed actuator array generates the vibration in wide frequency range and strong vibration of about 0.8 g (g = 9.8 m/s2) at a resonant frequency was noticed. We demonstrated and confirmed that the vibration acceleration of each cell unit can be controlled by the input voltage (0.1 kV to 3.5 kV) and can be operated individually. The data indicate that the proposed vibrotactile actuator array could have utility in center fascia, deformable or transparent devices.

Proceedings Article | 27 March 2019 Presentation + Paper

Self-deformable varifocal lens based on electroactive gel

Dong-Soo Choi, Ganesh Shimoga, Eun-Jae Shin, Sang-Youn Kim

Proceedings Volume 10969, 1096911 (2019) https://doi.org/10.1117/12.2518831

KEYWORDS: Electrodes, Microlens, Glasses, Electroactive polymers, Liquids, Optical components, Adaptive optics, Liquid lenses, Microfluidics, Solids

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There is ongoing uncertainty about the best way to mitigate the complication strategy in the development of varifocal lenses. Many efforts are being focused on the fabrication of adaptive focus lenses by a simple technique. Since the adaptive focus lenses change its curvature in response to the applied voltage; there has been a multitude of research is actively under progress. In this paper, we propose a compliant, highly transparent, and electroactive polymers based selfdeformable microlens for smart optical devices. Especially, a non-ionic PVC gel among electroactive polymers was selected to develop self-deformable microlens to avoid the solvent leakage because its actuation mechanism is not based on solvent-drag deformation but on creep deformation in an electric field, unlike ionic gel electrolytes. To make the convex shape on an actuation area of the proposed module, we put a rigid annular electrode on the electroactive PVC gel and apply pressure input by the rigid annular electrode. Later, we measure the focal length variations of the proposed varifocal lens with various thicknesses of electroactive gels. The resulting focal length values, obtained for the proposed module being large enough to use in small and compact optic devices.

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