{"id":372018,"date":"2024-07-16T00:35:04","date_gmt":"2024-07-16T00:35:04","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mode-profile-for-a-structured-optical-nanofiber\/"},"modified":"2024-07-16T00:35:04","modified_gmt":"2024-07-16T00:35:04","slug":"mode-profile-for-a-structured-optical-nanofiber","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mode-profile-for-a-structured-optical-nanofiber\/","title":{"rendered":"Mode profile for a structured optical nanofiber"},"content":{"rendered":"

Dear all,<\/p>\n

In my simulation file, I am aiming to calculate the transmisson of a beam with wavelength 1064 nm guided through an optical nanofiber with diameter 700 nm which also has a slot cut through it’s waist, shown in the Fig_01. <\/p>\n

 <\/p>\n

\"\"<\/p>\n

My simulation setting is as follows:<\/p>\n

– FDTD region: 4 um * 4um
– PML: 28
– Auto shutoff min: 1e-10
– ONF diameter: 700 nm
– Source: beam with 1064 nm in wavelength  and 10 um before the slot cut
– Slot cut: A rectangle with triangle-ends with total length 17 um and width 350 nm.
– Monitor position: 25 um away from the slot cut (Extra mesh grid with mesh size 3 nm * 3 nm was added at the monitor position for higher accuracy in the transmission calculation<\/p>\n

However the mode profile at the monitor position has such a distributation:<\/p>\n

\"\"<\/p>\n

As you can see, The mode profile does not reach zero at the end of the FDTD region.
Based on my previous experience, I am sure that increasin the simulation region will not fix this problem.
I wonder why it happens and how I should solve this problem.<\/p>\n

Thank you in advance,
Zohreh<\/p>\n","protected":false},"template":"","class_list":["post-372018","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t