Laser‐Induced Crystallization and Crystal Growth |
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| Authors: | Prof. Dr. Teruki Sugiyama Prof. Dr. Hiroshi Masuhara |
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| Affiliation: | 1. Graduate School of Materials Science, Nara Institute of Science and Technology, Takayama 8916‐5, Ikoma, Nara 630‐0192 (Japan), Fax: (+81)?743‐72‐6199;2. Instrument Technology Research Center, National Applied Research Laboratories, 20, R&D Rd. VI, Hsinchu Science Park, Hsinchu 30076 (Taiwan), Fax: (+886)?3‐5773947;3. Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, 1001 Ta Hsueh Road, Hsinchu 30010 (Taiwan), Fax: (+886)?3‐5712121 ext. 56593 |
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| Abstract: | Recent streams of laser studies on crystallization and crystal growth are summarized and reviewed. Femtosecond multiphoton excitation of solutions leads to their ablation at the focal point, inducing local bubble formation, shockwave propagation, and convection flow. This phenomenon, called “laser micro tsunami” makes it possible to trigger crystallization of molecules and proteins from their supersaturated solutions. Femtosecond laser ablation of a urea crystal in solution triggers the additional growth of a single daughter crystal. Intense continuous wave (CW) near infrared laser irradiation at the air/solution interface of heavy‐water amino acid solutions results in trapping of the clusters and evolves to crystallization. A single crystal is always prepared in a spatially and temporally controlled manner, and the crystal polymorph of glycine depends on laser power, polarization, and solution concentration. Upon irradiation at the glass/solution interface, a millimeter‐sized droplet is formed, and a single crystal is formed by shifting the irradiation position to the surface. Directional and selective crystal growth is also possible with laser trapping. Finally, characteristics of laser‐induced crystallization and crystal growth are summarized. |
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| Keywords: | crystallization crystal growth nonlinear processes polymorphism proteins |
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