We have demonstrated the simple preparation of structurally colored composite films by stacking alternating Os and PB
layers. Os has a much higher refractive index than PB, which causes the strong reflection at the interface between these
two materials. Strong reflection colors were observed because of the interference between the multi-layers. Active
control of the reflection peaks was achieved by swelling the PB layers. From these results, we conclude that black thin
layers enhance the reflection of structural colors.
An optical actuator has some interesting characteristics, such as no generation of magnetic noise and receiving the energy remotely. A novel micromanipulator by photothermal effect is proposed. It consists of three optical fiber cantilevers. One end of the fiber is cut for a bevel and painted with black color. A photothermal effect is occurred responding to the incident beam at the end of the optical fiber. It can manipulate a sample and move it in the arbitrary place in 3D space. We succeed to fabricate the 3D structures.
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