\n<\/strong><\/p>\n
Venue \u00a0\u00a0 : Thu 6 Oct 2016, 3pm (Murdoch University, Senate Room)<\/strong><\/p>\n We study how accurately a naked human eye can determine the thickness of thin \u001cfilms and the geometric parameters (height and width) of optical gratings from the observed color. Our approach is based on color-matching experiments, where a sample with unknown parameters is observed next to a reference \u001cfield of same size. The study of the limits of color discrimination and their dependence Detection of nanometer size differences through human color vision Speaker : Sandy Peterh\u00e4nsel, Stuttgart University Venue \u00a0\u00a0 : Thu 6 Oct 2016, 3pm (Murdoch University, Senate Room) We study how accurately a naked human eye can determine the thickness of thin \u001cfilms and the geometric parameters (height and width) of optical gratings from the observed […]<\/p>\n","protected":false},"author":1,"featured_media":1128,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1],"tags":[],"class_list":["post-1125","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/i0.wp.com\/from-snot-to-tissue-org.gerdschroeder-turk.org\/wp-content\/uploads\/2016\/10\/PeterhaenselSandy_Image.png?fit=1379%2C671&ssl=1","_links":{"self":[{"href":"https:\/\/from-snot-to-tissue-org.gerdschroeder-turk.org\/index.php?rest_route=\/wp\/v2\/posts\/1125","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/from-snot-to-tissue-org.gerdschroeder-turk.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/from-snot-to-tissue-org.gerdschroeder-turk.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/from-snot-to-tissue-org.gerdschroeder-turk.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/from-snot-to-tissue-org.gerdschroeder-turk.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1125"}],"version-history":[{"count":6,"href":"https:\/\/from-snot-to-tissue-org.gerdschroeder-turk.org\/index.php?rest_route=\/wp\/v2\/posts\/1125\/revisions"}],"predecessor-version":[{"id":1142,"href":"https:\/\/from-snot-to-tissue-org.gerdschroeder-turk.org\/index.php?rest_route=\/wp\/v2\/posts\/1125\/revisions\/1142"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/from-snot-to-tissue-org.gerdschroeder-turk.org\/index.php?rest_route=\/wp\/v2\/media\/1128"}],"wp:attachment":[{"href":"https:\/\/from-snot-to-tissue-org.gerdschroeder-turk.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1125"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/from-snot-to-tissue-org.gerdschroeder-turk.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1125"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/from-snot-to-tissue-org.gerdschroeder-turk.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1125"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\non surrounding conditions for human eyes are one of the major trends in color science [1]. For thin \u001clms this is done by placing the\u00a0 sample in direct contact to a LCD display, see Fig. 1. For matching of gratings the setup is more complex, as shown in \u001cgure 2. This is due to the fact, that only the zeroth order should be observed, as higher orders will lead to an angular dispersion of the wavelengths present in the spectrum of the light source.<\/p>\n![\"peterhaenselsandy_image\"](\"https:\/\/i0.wp.com\/from-snot-to-tissue-org.gerdschroeder-turk.org\/wp-content\/uploads\/2016\/10\/PeterhaenselSandy_Image.png?resize=505%2C246&ssl=1\")
\nIn both cases, the color of the reference fi\u001celd is matched by several test persons. From their selection the geometric properties of the thin \u001cfilms, as well as of the gratings are reconstructed via rigorous simulation. We found that the human color observation provides an extremely accurate evaluation of the \u001clm thickness and is comparable to sophisticated instrumental methods in this case. Even for the more complex reconstruction of the grating parameters an accuracy in the range of much more sophisticated methods like scanning\u00a0 electron microscopy could be observed. Our results suggest that for a wide range of structures, the\u00a0 color observation may help to get quick, but still accurate, results, without any sophisticated instrumentation.
\n[1] R.G. Kuehni, Color Res. Appl. 33(324), (2008).
\n[2] S. Peterh\u00e4nsel, H. Laamanen, J. Letholahti, M. Kuittinen, W. Osten and J. Tervo, Optica 2(7), (2015)
\n[3] S. Peterh\u00e4nsel, H. Laamanen, M. Kuittinen, J. Turunen, C. Pruss, W. Osten and J. Tervo, Opt. Lett. 39(3547), (2014)<\/p>\n","protected":false},"excerpt":{"rendered":"