<p> 1 Supplementary Information for 2</p><p>3</p><p>4 Optoelectrofluidic behavior of metal–polymer hybrid </p><p>5 colloidal particles</p><p>6</p><p>7 Dongsik Han, Hyundoo Hwang, and Je-Kyun Parka)</p><p>8</p><p>9 Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology </p><p>10 (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea</p><p>11</p><p>12</p><p>13</p><p>14 a) Electronic mail: [email protected] (J.-K. Park); Tel: +82-42-350-4315; Fax: +82-42-350- 15 4310. 16</p><p>1 1 2 1 Optically-induced AC electroosmosis (ACEO) flow in the optoelectrofluidic device 2</p><p>3 The ACEO flow could be observed with relatively small microbeads at the top and the </p><p>4 bottom surfaces as shown in Fig. S1. The particles came toward the light pattern near the bottom </p><p>5 surface. Then they showed vertical movement to the top electrode and moved away from the light</p><p>6 pattern along the top surface. These whole movements were in full accord with the distinguishing</p><p>7 feature of the ACEO flow in the optoelectrofluidic system.</p><p>8</p><p>9</p><p>10 FIG. S1. Microscopic images showing the motion of 3 μm polystyrene particles at the top and </p><p>11 the bottom surfaces of the liquid chamber in this optoelectrofluidic device in the application of an</p><p>12 ac voltage of 20 Vpeak-peak with 100 kHz (scale bar: 5 μm). Left portions in each image are </p><p>13 optically-generated virtual electrodes.</p><p>1 2 2</p>