Photoinduced Deformations in Chalcogenide Glasses

Department of Applied Physics, Graduate Schooi of Engineering, Hokkaido University, Kita-ku, Sapporo 060-8628, Japan keiji )eng.hokudai.ac.jp 

This chapter gives an overview of the photodeformations appearing in covalent and ionic chalcogenide glasses. The deformations are scalar or vector, and transitory or memorable. Some deformations are surprisingly prominent, being visible to the naked eye. We study these deformations with respect to mechanisms and applications. 

Photoinduced deformations are widespread on the earth. The most fantastic are undoubtedly plant growth and flower blooming, which may accompany heliotropism. In abiotic solids, soft materials such as fluids [Emile and Emile, 2011 Schmidt and Hawkins, 2011], dye-doped polymers [Barret et al., 2007), and chalcogenide glasses [Tanaka, 2005 Vateva, 2007 Tanaka et al., 2008 Yannopoulos and 

Trunov, 2009) are known to exhibit marked photodeformations, which have attracted continuing interest in induction mechanisms. In addition, photodeformations are promising for evolving direct optical shaping methods and novel optomechanical [OM] devices. 

Note Scalar and Vector denote isotropic and anisotropic (polarization-dependent deformations, and Memorable and Transitory indicate that the deformation remains after illumination and occurs only during illumination. Italics represent that the deformation appears only under illumination of focused light beams. 

---

Tanaka K., Photoinduced deformations in chalcogenide glasses Scalar and vectoral,/. Optoelectron. Adv. Mater., 7, 2571-2580. (2005). 

Tanaka K. and Mikami M., Photoinduced macroscopic vector deformations in chalcogenide glasses, JNon-Cryst. Solids, 358,2385-2388 (2012). 

Asao H. and Tanaka K, Polarization-dependent photoinduced mechanical deformations in covalent chalcogenide glasses, /. Appl. Phys., 102, 043508 (2007). 

Tanaka K., Terakado N., and Saitoh, Photoinduced anisotropic deformations in covalent chalcogenide glass, /. Optoeiectron. Adv. Mater., 10, 124-130 (2008). 

---