7 March 2007 The silicon mold fabrication of a kind of micro-optical resonator and coupler
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We present the fabrication of a kind of hexagonal and triangular cavity mold, which can cast Polymethyl Methacrylate (PMMA) resonators and couplers. The mold is designed on (111) silicon wafer according to its crystal structure and anisotropic etching properties in the etchant of ethylene diamine, pyrocatechol, and water (EDP/EPW), forming sidewalls by six {110} crystal surfaces, which are perpendicular to the (111) plane and constitute precise hexagons and triangles. The RIE-ICP etching is used to define the depth of the triangle and hexagonal cavities, and the following EDP etching smoothes the sidewalls of cavities. Only high temperature EDP etching is proved to be able to get smooth sidewalls. Before etching, the wafer is aligned to the right crystal orientation by pre-etched marks. The etched results of different geometrical cavities are analyzed and discussed based on the crystal structure.
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Hui Ju, Hui Ju, Takayuki Ohta, Takayuki Ohta, Satoru Takao, Satoru Takao, Masafumi Ito, Masafumi Ito, Minoru Sasaki, Minoru Sasaki, Kazuhiro Hane, Kazuhiro Hane, Masaru Hori, Masaru Hori, } "The silicon mold fabrication of a kind of micro-optical resonator and coupler", Proc. SPIE 6462, Micromachining Technology for Micro-Optics and Nano-Optics V and Microfabrication Process Technology XII, 64620I (7 March 2007); doi: 10.1117/12.697130; https://doi.org/10.1117/12.697130

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