We present a controlling technique of microporous structure by laser irradiation during self-organization process. Selforganization\r\nprocess is fabrication method of microstructure. Polymer solution was dropped on the substrate at high humid\r\ncondition. Water in air appears dropping air temperature below the dew point. The honeycomb structure with regularly aligned\r\npores on the film was fabricated by attaching water droplets onto the solution surface. We demonstrate that it was possible to\r\nprevent forming pores at the region of laser irradiation and flat surface was fabricated. We also demonstrated that a combination\r\nstructure with two pore sizes and flat surface was produced by a single laser-pulse irradiation. Our method is a unique\r\nmicrofabrication processing technique that combines the advantages of bottom-up and top-down techniques. This method is a\r\npromising technique that can be applied to produce for photonic crystals, biological cell culturing, surface science and electronics\r\nfields, and so forth.
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