Electromechanical effects in free standing FLC elastomer films as determined by interferometric measurements
The electrically induced thickness variations of homeotropically oriented free standing films of a smectic (C* and A*) ferroelectric liquid crystalline elastomer (FLCE) have been examined. For this purpose an interferometric setup has been built with a resolution of 3 pm at 133 Hz AC excitation freq...
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| Veröffentlicht in: | Ferroelectrics 2000-01, Vol.243 (1), p.107-114 |
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| creator | Lehmann, Walter Skupin, Holger Kremer, Friedrich Gebhard, Elisabeth Zentel, Rudolf |
| description | The electrically induced thickness variations of homeotropically oriented free standing films of a smectic (C* and A*) ferroelectric liquid crystalline elastomer (FLCE) have been examined. For this purpose an interferometric setup has been built with a resolution of 3 pm at 133 Hz AC excitation frequency. The laser beam has been focussed by means of two "long distance" microscope objective lenses in order to study small homogeneous areas in the film. The changes in optical pathlength through the sample were measured at the first (ω), second (2ω) and fourth (4ω) harmonic of the AC-electric excitation voltage (ω=133 Hz). The measured thickness (optical pathlength) modulation at the 2
nd
harmonic is in the range of some % and thus stronger than expected from FTIR-measurements on the electroclinic effect in CaF
2
cells filled with this sample. Nevertheless, the strength of this quadratic effect and also of the linear effect is greatly increased at the phase transition Sm-C*-Sm-A*, which indicates a correlation of the thickness variation with the electroclinic effect. |
| doi_str_mv | 10.1080/00150190008008012 |
| format | Article |
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nd
harmonic is in the range of some % and thus stronger than expected from FTIR-measurements on the electroclinic effect in CaF
2
cells filled with this sample. Nevertheless, the strength of this quadratic effect and also of the linear effect is greatly increased at the phase transition Sm-C*-Sm-A*, which indicates a correlation of the thickness variation with the electroclinic effect.</description><identifier>ISSN: 0015-0193</identifier><identifier>EISSN: 1563-5112</identifier><identifier>DOI: 10.1080/00150190008008012</identifier><language>eng</language><publisher>Taylor & Francis Group</publisher><subject>ferroelectric ; free standing films: electromechanical effects ; liquid crystalline elastomers ; piezoelectric</subject><ispartof>Ferroelectrics, 2000-01, Vol.243 (1), p.107-114</ispartof><rights>Copyright Taylor & Francis Group, LLC 2000</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c375t-d1b38784fcb9a4a43830d4c303082ec013fc0443e8fabb6ea041950a095c6b263</citedby><cites>FETCH-LOGICAL-c375t-d1b38784fcb9a4a43830d4c303082ec013fc0443e8fabb6ea041950a095c6b263</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.tandfonline.com/doi/pdf/10.1080/00150190008008012$$EPDF$$P50$$Ginformaworld$$H</linktopdf><linktohtml>$$Uhttps://www.tandfonline.com/doi/full/10.1080/00150190008008012$$EHTML$$P50$$Ginformaworld$$H</linktohtml><link.rule.ids>314,777,781,27906,27907,59627,60416</link.rule.ids></links><search><creatorcontrib>Lehmann, Walter</creatorcontrib><creatorcontrib>Skupin, Holger</creatorcontrib><creatorcontrib>Kremer, Friedrich</creatorcontrib><creatorcontrib>Gebhard, Elisabeth</creatorcontrib><creatorcontrib>Zentel, Rudolf</creatorcontrib><title>Electromechanical effects in free standing FLC elastomer films as determined by interferometric measurements</title><title>Ferroelectrics</title><description>The electrically induced thickness variations of homeotropically oriented free standing films of a smectic (C* and A*) ferroelectric liquid crystalline elastomer (FLCE) have been examined. For this purpose an interferometric setup has been built with a resolution of 3 pm at 133 Hz AC excitation frequency. The laser beam has been focussed by means of two "long distance" microscope objective lenses in order to study small homogeneous areas in the film. The changes in optical pathlength through the sample were measured at the first (ω), second (2ω) and fourth (4ω) harmonic of the AC-electric excitation voltage (ω=133 Hz). The measured thickness (optical pathlength) modulation at the 2
nd
harmonic is in the range of some % and thus stronger than expected from FTIR-measurements on the electroclinic effect in CaF
2
cells filled with this sample. Nevertheless, the strength of this quadratic effect and also of the linear effect is greatly increased at the phase transition Sm-C*-Sm-A*, which indicates a correlation of the thickness variation with the electroclinic effect.</description><subject>ferroelectric</subject><subject>free standing films: electromechanical effects</subject><subject>liquid crystalline elastomers</subject><subject>piezoelectric</subject><issn>0015-0193</issn><issn>1563-5112</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2000</creationdate><recordtype>article</recordtype><recordid>eNqFkEFrGzEQhUVIIE7SH9CbTr1tO1pJ3l3opRgnLRhySc5iVjtqFbRaR5Jp_e8r494CDQwMb-Z9j2EY-yjgs4AevgAIDWIAqKKWaC_YSui1bLQQ7SVbnfZNNchrdpPzS5VSqWHFwjaQLWmZyf7C6C0GTs7VUeY-cpeIeC4YJx9_8vvdhlPAXKo7cefDnDlmPlGhNPtIEx-PlarK0SmxJG_5TJgPiWaKJd-xK4ch04d__ZY932-fNt-b3ePDj823XWNlp0sziVH2Xa-cHQdUqGQvYVJWgoS-JVtPdxaUktQ7HMc1ISgxaEAYtF2P7Vresk_n3H1aXg-Ui5l9thQCRloO2bSd1qA7VY3ibLRpyTmRM_vkZ0xHI8Cc_mre_LUyX8-Mj25JM_5eUphMwWNYkksYrc9G_g_v3sXfUKb8KfIvqj6RKw</recordid><startdate>20000101</startdate><enddate>20000101</enddate><creator>Lehmann, Walter</creator><creator>Skupin, Holger</creator><creator>Kremer, Friedrich</creator><creator>Gebhard, Elisabeth</creator><creator>Zentel, Rudolf</creator><general>Taylor & Francis Group</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope></search><sort><creationdate>20000101</creationdate><title>Electromechanical effects in free standing FLC elastomer films as determined by interferometric measurements</title><author>Lehmann, Walter ; Skupin, Holger ; Kremer, Friedrich ; Gebhard, Elisabeth ; Zentel, Rudolf</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c375t-d1b38784fcb9a4a43830d4c303082ec013fc0443e8fabb6ea041950a095c6b263</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2000</creationdate><topic>ferroelectric</topic><topic>free standing films: electromechanical effects</topic><topic>liquid crystalline elastomers</topic><topic>piezoelectric</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lehmann, Walter</creatorcontrib><creatorcontrib>Skupin, Holger</creatorcontrib><creatorcontrib>Kremer, Friedrich</creatorcontrib><creatorcontrib>Gebhard, Elisabeth</creatorcontrib><creatorcontrib>Zentel, Rudolf</creatorcontrib><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Ferroelectrics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lehmann, Walter</au><au>Skupin, Holger</au><au>Kremer, Friedrich</au><au>Gebhard, Elisabeth</au><au>Zentel, Rudolf</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Electromechanical effects in free standing FLC elastomer films as determined by interferometric measurements</atitle><jtitle>Ferroelectrics</jtitle><date>2000-01-01</date><risdate>2000</risdate><volume>243</volume><issue>1</issue><spage>107</spage><epage>114</epage><pages>107-114</pages><issn>0015-0193</issn><eissn>1563-5112</eissn><abstract>The electrically induced thickness variations of homeotropically oriented free standing films of a smectic (C* and A*) ferroelectric liquid crystalline elastomer (FLCE) have been examined. For this purpose an interferometric setup has been built with a resolution of 3 pm at 133 Hz AC excitation frequency. The laser beam has been focussed by means of two "long distance" microscope objective lenses in order to study small homogeneous areas in the film. The changes in optical pathlength through the sample were measured at the first (ω), second (2ω) and fourth (4ω) harmonic of the AC-electric excitation voltage (ω=133 Hz). The measured thickness (optical pathlength) modulation at the 2
nd
harmonic is in the range of some % and thus stronger than expected from FTIR-measurements on the electroclinic effect in CaF
2
cells filled with this sample. Nevertheless, the strength of this quadratic effect and also of the linear effect is greatly increased at the phase transition Sm-C*-Sm-A*, which indicates a correlation of the thickness variation with the electroclinic effect.</abstract><pub>Taylor & Francis Group</pub><doi>10.1080/00150190008008012</doi><tpages>8</tpages></addata></record> |
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| subjects | ferroelectric free standing films: electromechanical effects liquid crystalline elastomers piezoelectric |
| title | Electromechanical effects in free standing FLC elastomer films as determined by interferometric measurements |
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