{"id":363444,"date":"2024-04-22T09:25:50","date_gmt":"2024-04-22T09:25:50","guid":{"rendered":"\/forum\/?post_type=topic&#038;p=363444"},"modified":"2024-04-22T09:25:50","modified_gmt":"2024-04-22T09:25:50","slug":"discrepancy-in-transmission-coefficients-when-calculated-using-s-para-analysis","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/discrepancy-in-transmission-coefficients-when-calculated-using-s-para-analysis\/","title":{"rendered":"Discrepancy in Transmission coefficients when calculated using S-para analysis"},"content":{"rendered":"<p><span style=\"font-size: 10pt\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/22-04-2024-1713777907-CM10.png\" alt=\"\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/22-04-2024-1713777863-Screenshot 2024-04-22 144633.png\" alt=\"\">In the Parameter sweep, I rotate the meta atom to get the phase shift and its transmission coefficients for the RCP incident light using a transmission monitor. (Two sources where the polarization angle of 1 source is set to 0 degrees and the other is set to 90 degrees and the phase shift between the two sources is -90 degrees). The light is incident on the meta atom from the air side, not the substrate side)&nbsp; I get one set of Transmission coefficients using this approach. I used another approach to calculate the same. I did the parameter sweep for different theta values, for x polarised light and y polarised light as well, and then using the s parameter analysis I calculated the phase shift and the transmission coefficients for both RCP and LCP incidence. I will attach the code in the attachment. The result that is get is different. I am basically doing the same thing using the different approaches. Then what is the reason for the discrepancy? Can anyone please clarify my doubt?<\/span><\/p>\n<p><span style=\"font-size: 10pt\">I also have another basic doubt( Silly doubt ), when we are calculating the Transmission coefficients from the s parameter, should we do the abs or absolute squared?<\/span><span style=\"font-size: 10pt\"><img decoding=\"async\" title=\"Code for calculating transmission coefficients\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/22-04-2024-1713777762-Screenshot 2024-04-22 144601.png\" alt=\"\"><img decoding=\"async\" title=\"This is through the Parameter sweep I did for the RCP light incidence\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/22-04-2024-1713777517-Screenshot 2024-04-22 144521.png\" alt=\"\"><\/span><\/p>\n","protected":false},"template":"","class_list":["post-363444","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"In the Parameter sweep, I rotate the meta atom to get the phase shift and its transmission coefficients for the RCP incident light using a transmission monitor. 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