爱学术-智能检索

激光聚焦

CRC Press Kotlyar, Victor V Stafeev, Sergey S Nalimov, Anton

ISBN：9780367364441，出版年：2019，中图分类号：O4

Readers will learn in which ways light can be "confined" within a subwavelength region smaller than half a wavelength. Strictly within the focal spot, all degrees of freedom of light interact and manifest themselves in a dramatic way. The size and shape of the focal spot and the magnitude of side-lobes depend on the polarization state alongside phase and amplitude distributions of a light beam. Readers will learn techniques in which inhomogeneously (i.e., azimuthally and radially) polarized optical beams can be focused. In sharp focus, exotic phenomena can occur, including the negative propagation of light and a toroidal optical flow. Throughout the book, the numerical simulation is performed using the rigorous solution of Maxwell equations based on a Finite-Difference Time-Domain (FDTD) approach, which makes the results of modeling highly reliable. The photonic components, including optical metasurfaces, discussed in the book have been implemented using state-of-the-art techniques of electron beam writing and reactive ion-beam etching of microrelief. Two chapters are concerned with photonics hot spots, which deal with the control of light by means of optical metasurfaces and the generation of an energy backflow in the region of sharp focus of a laser beam. Another hot topic is diffractive polarization converters implemented as subwavelength diffraction gratings to convert polarization of light. By way of illustration, such converters are shown to perform linear-to-radial or linear-to-azimuthal polarization conversion. The book describes advanced photonic components fabricated by the authors to perform sharp focusing of light, including binary zone plates, binary axicons, a planar photonic crystal lens, diffraction polarization converters, and metalenses. This book is a must-have for individuals and institutions studying cutting edge optics.

Laser-induced fluorescence Pulsed laser ablation Pulsed laser deposition Laser peening Laser beam machining Soft laser desorption Laser-induced breakdown spectroscopy Laser ablation Tunable laser Laser engraving

Biological Events Probed by Ultrafast Laser Spectroscopy

超快激光光谱探测生物事件

Academic Press_RM

ISBN：9780120499502，出版年：2012，中图分类号：TN

Biological Events Probed by Ultrafast Laser Spectroscopy summarizes the progress in the experimental and theoretical understanding of primary phenomena occurring in biology on a picoseconds and nanosecond time scale. This book includes basic principles, survey of research results, and thinking of experts in the fields of photosynthesis, vision, hemoglobin, and DNA. This reference is organized into five parts. The primary events in the various areas of biology are reviewed in the first four parts. The last part covers the picosecond and subpicosecond laser techniques. Primary processes in photosynthesis are then discussed. This is followed by chapters on fluorescence and absorption kinetic measurements in higher plants. Subsequent chapters cover kinetic measurements in bacteria photosynthesis, theories of primary energy transfer appropriate to photosynthesis, and multiexcitation processes. Part II examines primary visual processes, including kinetic experimental work on rhodopsin and bacteriorhodopsin, and theoretical concepts on primary events in vision. The third part presents the introductory materials on the kinetic models of hemoglobin and myoglobin. It also discusses the interesting picosecond measurements on these proteins. Part IV focuses on the application of modern ultrafast temporal techniques to the study of DNA and its components, as well as DNA-dye complexes. The concluding part introduces the principles of design and operation of the solid state laser and picoseconds spectroscopy methods. A discussion on pulse generation methods and measurement techniques applicable for measuring primary events in biological systems is provided. This book is useful both for the newbies and experts in the field of ultrafast phenomena. It aims to attract biologists, chemists, physicists, and engineers who are interested in biological processes. It will help readers find all the necessary and relevant material in one presentation.

Organic laser Laser-induced breakdown spectroscopy Laser-induced fluorescence Laser Doppler velocimetry Biomedical spectroscopy Confocal laser scanning microscopy Laser velocimetry Atp bioluminescence Laser Scanning Cytometry High power lasers