Microstructures Formed on Low-fluorescence-intensity Glass Using Glassy<br>Carbon Mold and Q-switched Laser

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  • Qスイッチレーザー加工によるカーボン型を用いた<br>低蛍光ガラスのマイクロ成形
  • Q スイッチ レーザー カコウ ニ ヨル カーボンガタ オ モチイタ テイケイコウ ガラス ノ マイクロ セイケイ

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Abstract

Micro-nanoimprinting or hot embossing is a target of interest for the industrial production of micro-nano devices because of it's of low cost. In fluidic micro electromechanical system (MEMS) applications, polymer materials have been employed to fabricate economical products owing to their low cost. However, glass is much more suitable for high-temperature applications or adverse chemical environments. Moreover, the UV absorption level of glass materials is much lower than that of polymers, which is advantageous for bioanalysis. In optical MEMSs as well, glass is a good candidate material for achieving good optical properties, such as a high refractive index and a low UV absorption level. In our previous study, micro/nanoimprinting was developed for glass using a glassy carbon (GC) mold prepared by focused-ion-beam (FIB) machining. The disadvantages of FIB machining are the limited area in which etching can be carried out and the long machining time. The typical machining area in FIB is limited to within less than 0.25mm2. Therefore, we used laser machining for GC mold fabrication. The laser is a Q-switched Nd: YAG laser. This method shows great potential for fabricating bio-MEMS devices efficiently and at a very low cost. The main target is to fabricate devices for highly sensitive fluorescence detection applications; this fabrication is very difficult to realize using plastic substrates. A multichannel pattern (with 70μm line and 400μm space) was generated on a 20-mm square glassy carbon what using a YAG laser machine. Replication of the pattern on glass chips was demonstrated. Micro-hot-embossed test structures were successfully developed with high fidelity. These fabricated microstructures can be applied to the fabrication of fluidic channels.

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