Hi Everyone,<\/p>\n
I’m a university undergraduate student trying to do my final year project. I’ve been given the wonderful task to design a dielectric slab waveguide made up of 5 layers, but first, just so I can practice I want to do a 3 layer slab waveguide (cladding-core-cladding) in Lumeical. <\/p>\n
I’ve tried to ask my supervisor to help me find and understand numerical methods to find appropriate thicknesses for the cladding and core of the waveguide, but he really wants me to use the sweep and optimisation function in Lumerical. I tried to ask him how I should do it in Lumerical, but I just got “I’m not an expert in Lumerical”.. even though he used it. So I hope, someone here will be able to help me.<\/p>\n
What I would need to do in Lumerical, is to find appropriate thicknesses for the core and cladding so only the first (or a very few number of) TE\/TM mode is let through the waveguide.<\/p>\n
My main problems\/concerns:<\/p>\n
I managed to make the structure of the 3 layered dielectric waveguide in lumerical with the appropriate refractive indexes and some not so random thicknesses (from a research paper). But when I try to use the sweep function of Lumerical… I tell Lumerical that sweep graph should show the effective indexes against the core thickness which increases from 0.1um to 5um let’s say… and when I press run on the sweep and I see the structure change, when I see the core thickness change and it goes from 0.1um to 5um, the structure has gaps between the core and cladding when the sweep is at the lower thicknesses and when it reaches higher thicknesses, the core goes into the cladding above and below it… essentially blending together.<\/p>\n
I haven’t managed to figure out if this is how Lumerical sweeps should work, or if I missed out a crucial step that would keep the structure together while the sweep changes the thicknesses.<\/p>\n
Could I ask anyone out there, to give me a somewhat detailed description on how I should setup my dielectric sturcture and the sweep function so I could optimise the thickness of the core and claddin to only support one mode? I would really appreciate it!<\/p>\n
Kind Regards,<\/p>\n
Marton<\/p>\n","protected":false},"template":"","class_list":["post-346684","topic","type-topic","status-closed","hentry","topic-tag-1d","topic-tag-2d","topic-tag-Dielectric-1","topic-tag-dielectric-waveguide","topic-tag-FDE-1","topic-tag-lumerical","topic-tag-optimisation-2","topic-tag-sweep","topic-tag-waveguide-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["61317","33648"],"_bbp_author_ip":["23.206.193.146"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1687"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["346684"],"_bbp_forum_id":["27833"],"_bbp_engagement":["33648","61317"],"_bbp_voice_count":["2"],"_bbp_reply_count":["37"],"_bbp_last_reply_id":["356730"],"_bbp_last_active_id":["356730"],"_bbp_last_active_time":["2024-03-12 21:17:48"]},"test":"mla010student-bham-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/346684","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/346684\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=346684"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}