{"id":436949,"date":"2025-07-15T21:44:35","date_gmt":"2025-07-15T21:44:35","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/lumerical-charge-matrices-for-current\/"},"modified":"2025-07-15T21:44:35","modified_gmt":"2025-07-15T21:44:35","slug":"lumerical-charge-matrices-for-current","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/lumerical-charge-matrices-for-current\/","title":{"rendered":"Lumerical Charge Matrices for current"},"content":{"rendered":"

<p>Hi Everyone<br><br>Hope you all are doing good. <\/p><p>I am facing an issue with the size of matrices and hence the result while doing a lumerical charge simulation. It would be great if someone could explain to me the following (it’s after I define a dc voltage sweep – total 26 points, on one of my electrodes out of three electrodes and I perform a ssac – AC analysis – total of 20 frequency sweep points, and then use the command “run Charge” in the lumerical script:<\/p><div data-olk-copy-source=”MessageBody”>1. I would like to know how is dI (or dIp, dIn) calculated in Lumerical charge when the it is run for a p-n junction Si MZM modulator? I mean what’s the order of the matrix and how’s it dependent on the number of electrodes?<\/div><div> <\/div><div>2. I have three electrodes. For a simpler case, I am keeping the ac signal on only one electrode, the second electrode is kept at ground (but I intend to use it for differential signalling) and the third electrode is the ground for both the signals, always. I am getting an incomplete dI matrix for my case when I am trying to follow the traveling MZM modulator example by Ansys. I can only see a 2×26 matrix for dI.<\/div><div> <\/div><div>3.How does the I = pinch(Result.dI) function work for my case? I can know this if I can know how lumerical Charge calculates the matrices for dI. I see a 26×2 matrix for I in visualize data but I see it’s size in the script results window as 26,2,20.<\/div><div> <\/div><div>I have been trying to find out the principle of such matrices from the Ansys sources but have been unsuccessful.<br><br>I look forward to some insight into it.<\/div><div> <\/div><div>BR,<br>Ravi<\/div><\/p>\n","protected":false},"template":"","class_list":["post-436949","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27833"],"_bbp_topic_id":["436949"],"_bbp_subscription":["573700","50911"],"_bbp_author_ip":["152.78.0.22"],"_bbp_last_reply_id":["438158"],"_bbp_last_active_id":["438158"],"_bbp_last_active_time":["2025-07-30 12:29:04"],"_bbp_reply_count":["6"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["573700","50911"],"_btv_view_count":["317"],"_bbp_topic_status":["unanswered"],"_edit_lock":["1752625453:473055"],"_bbp_notification_enabled":["473055"]},"test":"r-s-pokhariasoton-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/436949","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\/436949\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=436949"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}