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11 February 2010 Review: Tg - reversible glass door to fabrication of photonic devices and integrated circuits
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We review our development of sub-micron hot embossing or imprinting of glasses. We suggest that this is an emerging technology which shows great promise for the fabrication of glass photonic integrated circuits (PICs). The approach makes use of Tg (the glass transition) which gives inorganic compound glasses a key advantage over crystalline materials for fabricating photonic devices and PICs. Thus, when a glass is heated above Tg, the glass transforms to a supercooled liquid which may be shaped e.g. moulded. Cooling back down through Tg allows the shaping to be retained in the glassy state at room temperature. In this way, glasses may be shaped from the macro-scale e.g. to make light-refracting lenses down to the nano-scale e.g. for waveguides or photonic crystal arrays for dispersion management. Hence Tg is a reversible door to making photonic devices. This claim is illustrated by reviewing our recent work on hot embossing of inorganic compound glasses to make waveguides. Opportunities and potential pitfalls are highlighted. The background understanding of glass science underpinning the hot embossing methodology is presented.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. B. Seddon, D. Furniss, Z. G. Lian, W. J. Pan, and T. M. Benson "Review: Tg - reversible glass door to fabrication of photonic devices and integrated circuits", Proc. SPIE 7604, Integrated Optics: Devices, Materials, and Technologies XIV, 76040V (11 February 2010);

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