Microchemistry. Spectroscopy and Chemistry in Small Domains by H. Masuhara, F. C. De Schryver, N. Kitamura, N. Tamai

By H. Masuhara, F. C. De Schryver, N. Kitamura, N. Tamai

Microchemistry is an interdisciplinary quarter within which suitable effects are offered and released in various fields together with spectroscopy, optics, utilized physics, electrochemistry and polymer technology. This quantity collects for the 1st time the entire most up-to-date learn and effects and classifies them into 5 components. Optical micromanipulation and production, microfabrication and functionalization and dynamic Read more...

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35 Optica l harmon y of microparticle s in solutio n N. Kitamura,*># K. Sasaki,t H. Misawa,^ and H. Masuhara*>t Microphotoconversion Project,§ ERATO Program, Research Development Corporation of Japan, 15 Morimoto-cho, Shimogamo, Sakyo-ku, Kyoto 606, Japan An optical manipulation technique has been applied to control Brownian motion of microparticles in solution and to produce dynamic optical patterns of the particles like rhythms and harmony in their movement. Microparticles were arbitrarily aligned in any letters or geometrical figures by a focused infrared laser beam and, the patterns made of the particles were shown to be manipulated in three-dimensional space as well.

Schematic representations of the spatial distributions of a focused laser beam intensities (a) and (b) and the relevant potentials of the radiation pressure (c)-(e). Laser trapping and scanning micromanipulation of fine particles 33 Figure 10. Optical trapping of an iron particle (3 ìðé) in water. The arrow indicated in the figure represents the locus of the scanning laser beam, and the particle inside of the locus is optically caged. Figure 10 shows optical trapping of an iron particles (3 ìðé) in water.

When n p > n m, the polarizability á is a positive value so that the gradient force is directed to the high electric field intensity region. The second term is derived from the change in the direction of a pointing vector, which is called scattering force. Since the gradient force is usually much stronger than the scattering force, the radiation pressure attracts the particle to the high intensity region, which is the same phenomenon as for the case of the large particle. Hence, arbitrarily-sized particles can be trapped at a focal spot of a laser beam.

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