{"id":407357,"date":"2017-05-12T02:00:00","date_gmt":"2017-05-11T23:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=0311a8dcfb0b205b1938c970576fcfcb"},"modified":"2017-05-12T02:00:00","modified_gmt":"2017-05-11T23:00:00","slug":"on-deriving-the-maxwell-stress-tensor-method-for-calculating-the-optical-force-and-torque-on-anobject-in-harmonic-electromagnetic-fields","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=407357","title":{"rendered":"On deriving the Maxwell stress tensor method for calculating the optical force and torque on an\r\nobject in harmonic electromagnetic fields"},"content":{"rendered":"<p>Though extensively used in calculating optical force and torque acting on a material object<br \/>\nilluminated by laser, the Maxwell stress tensor (MST) method follows the electromagnetic linear and<br \/>\nangular momentum balance that is usually derived in most textbooks for a continuous volume charge<br \/>\ndistribution in free space , if not resorting to the application of Noether\u2019s theorem in<br \/>\nelectrodynamics. To cast the conservation laws into a physically appealing form involving the<br \/>\ncurrent densities of linear and angular momentum, on which the MST method is based, the divergence<br \/>\ntheorem is employed to transform a volume integral into a surface integral. When a material object<br \/>\nof finite volume is put into the field, it brings about a discontinuity of field across its surface,<br \/>\ndue to the presence of induced surface charge and surface current. Ambiguity arises among students<br \/>\nin whether the divergence theorem can still be directly used without any justification. By taking<br \/>\ninto account the e&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Though extensively used in calculating optical force and torque acting on a material object<br \/>\nilluminated by laser, the Maxwell stress tensor (MST) method follows the electromagnetic linear and<br \/>\nangular momentum balance that is usually derived in most t&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-407357","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/407357","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=407357"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/407357\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=407357"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=407357"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=407357"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}