High-speed electron microscopy of laser-induced vaporization of thin films
Laser-driven explosive vaporization of free germanium films was investigated with a high-speed transmission electron microscope. Double frame and streak imaging with nanoseconds exposure and sweep times were exploited to visualize the fast processes. Using focused 30-ns laser pulses of about 1 μJ an...
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Veröffentlicht in: | Journal of applied physics 1991-02, Vol.69 (4), p.2581-2583 |
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creator | BOSTANJOGLO, O KORNITZKY, J TORNOW, R. P |
description | Laser-driven explosive vaporization of free germanium films was investigated with a high-speed transmission electron microscope. Double frame and streak imaging with nanoseconds exposure and sweep times were exploited to visualize the fast processes. Using focused 30-ns laser pulses of about 1 μJ and 10 MW/cm2, the films were shattered within 100–300 ns by three cooperating mechanisms: Marangoni flow, jerky boiling, and capillary forces. These effects are very different from those ablating supported films. They suggest that large temperature gradients of 1000 K/μm centered near 4000 K are generated within the laser spot, and the homogeneous nucleation theory of boiling is not applicable. |
doi_str_mv | 10.1063/1.348647 |
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P</creator><creatorcontrib>BOSTANJOGLO, O ; KORNITZKY, J ; TORNOW, R. P</creatorcontrib><description>Laser-driven explosive vaporization of free germanium films was investigated with a high-speed transmission electron microscope. Double frame and streak imaging with nanoseconds exposure and sweep times were exploited to visualize the fast processes. Using focused 30-ns laser pulses of about 1 μJ and 10 MW/cm2, the films were shattered within 100–300 ns by three cooperating mechanisms: Marangoni flow, jerky boiling, and capillary forces. These effects are very different from those ablating supported films. 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They suggest that large temperature gradients of 1000 K/μm centered near 4000 K are generated within the laser spot, and the homogeneous nucleation theory of boiling is not applicable.</description><subject>Condensed matter: structure, mechanical and thermal properties</subject><subject>Exact sciences and technology</subject><subject>Physical properties of thin films, nonelectronic</subject><subject>Physics</subject><subject>Solid surfaces and solid-solid interfaces</subject><subject>Surface energy; thermodynamic properties</subject><subject>Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties)</subject><issn>0021-8979</issn><issn>1089-7550</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1991</creationdate><recordtype>article</recordtype><recordid>eNpF0M1KAzEUBeAgCtYq-AizUdyk3iSTSbKUolYpuNF1SNM7NpL5MZkK9emd0oKru7gfB84h5JrBjEEl7tlMlLoq1QmZMNCGKinhlEwAOKPaKHNOLnL-AmBMCzMhr4vwuaG5R1wXGNEPqWuLJvjUZd_1u6Kri-gyJhra9daP6Mf1XQq_bggjHL_DJrRFHWKTL8lZ7WLGq-Odko-nx_f5gi7fnl_mD0vqua4GataOmxWIkpWqhlJWsDIlZ4jCa27QCC61kBpBMq0UM1xLdMqgl9xzo7yYkttDbp-67y3mwTYhe4zRtdhts-WS87EbjPDuAPdtcsLa9ik0Lu0sA7sfyzJ7GGukN8dMl72LdXKtD_nfm4pJbaT4A80wZ2o</recordid><startdate>19910215</startdate><enddate>19910215</enddate><creator>BOSTANJOGLO, O</creator><creator>KORNITZKY, J</creator><creator>TORNOW, R. 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P</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c286t-9da29b034147f04560b9421ee3c829e93258358e05187719285ea79ec52c297c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1991</creationdate><topic>Condensed matter: structure, mechanical and thermal properties</topic><topic>Exact sciences and technology</topic><topic>Physical properties of thin films, nonelectronic</topic><topic>Physics</topic><topic>Solid surfaces and solid-solid interfaces</topic><topic>Surface energy; thermodynamic properties</topic><topic>Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties)</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>BOSTANJOGLO, O</creatorcontrib><creatorcontrib>KORNITZKY, J</creatorcontrib><creatorcontrib>TORNOW, R. 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P</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>High-speed electron microscopy of laser-induced vaporization of thin films</atitle><jtitle>Journal of applied physics</jtitle><date>1991-02-15</date><risdate>1991</risdate><volume>69</volume><issue>4</issue><spage>2581</spage><epage>2583</epage><pages>2581-2583</pages><issn>0021-8979</issn><eissn>1089-7550</eissn><coden>JAPIAU</coden><abstract>Laser-driven explosive vaporization of free germanium films was investigated with a high-speed transmission electron microscope. Double frame and streak imaging with nanoseconds exposure and sweep times were exploited to visualize the fast processes. Using focused 30-ns laser pulses of about 1 μJ and 10 MW/cm2, the films were shattered within 100–300 ns by three cooperating mechanisms: Marangoni flow, jerky boiling, and capillary forces. These effects are very different from those ablating supported films. They suggest that large temperature gradients of 1000 K/μm centered near 4000 K are generated within the laser spot, and the homogeneous nucleation theory of boiling is not applicable.</abstract><cop>Woodbury, NY</cop><pub>American Institute of Physics</pub><doi>10.1063/1.348647</doi><tpages>3</tpages></addata></record> |
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subjects | Condensed matter: structure, mechanical and thermal properties Exact sciences and technology Physical properties of thin films, nonelectronic Physics Solid surfaces and solid-solid interfaces Surface energy thermodynamic properties Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties) |
title | High-speed electron microscopy of laser-induced vaporization of thin films |
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