I've currently got the same lattice structure as that in chapter 4.6, with the same layout of supercell (i.e. one point in the middle and a quarter of a point on each corner), but am not getting the results I'm expecting-I think the problem lies with either the k_point setting, or an incorrect phase-if I'm honest I'm not sure what the phase offset should be. Could someone confirm the correct k-point in terms of the lattice vector and correct phase offset for an x-polarised source above the plane of the lattice?
-- Lydia Fulloway Scientist Malvern Optical Ltd Tel: +44 (0)1386 553188 Mobile: +44 (0)7985 678681 email: <mailto:lafullo...@malvernoptical.co.uk> lafullo...@malvernoptical.co.uk Hangar 3, Pershore Airfield, Long Lane, Throckmorton, Worcestershire, WR10 2JH United Kingdom www.malvernoptical.co.uk <http://www.malvernoptical.co.uk> CONFIDENTIALITY NOTICE: This e-mail message from Malvern Optical Ltd (including all attachments) is for the sole use of the intended recipient (s) and may contain confidential and privileged information. Any unauthorised review, use, disclosure, copying or distribution is strictly prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. Malvern Optical Limited is registered in England and Wales, Company Number 7426527 and having its registered office at: Building 71, Pershore Airfield, Long Lane, Throckmorton, Worcestershire, WR10 2JH From: Ardavan Oskooi <ardavan.osk...@gmail.com> Sent: 14 October 2020 01:45 To: lafullo...@malvernoptical.co.uk; meep-discuss@ab-initio.mit.edu Subject: Re: [Meep-discuss] Phase offsets of sources in supercells You can set the relative phase of any two sources using the amplitude property. Note that if you set the amplitude to a complex value, you will also likely need to set force_complex_fields=True in the Simulation constructor since Meep uses real fields by default. For more details on sources in supercells, see Section 4.6 of our book chapter: https://arxiv.org/abs/1301.5366. On 10/13/20 02:11, lafullo...@malvernoptical.co.uk <mailto:lafullo...@malvernoptical.co.uk> wrote: Hi, I've been using a supercell to represent a non-orthogonal lattice. I know I need to use two sources to counter the effects of band folding in reflection or transmission measurements, however I'm struggling to get the correct results out from simulations. The two (Gaussian) sources currently in the supercell are separated by a lattice vector, but I think the problem lies with the phase offset between them. Does anyone know how to correctly use a time delay between the two sources (or any other method) in order to create the correct phase offset for countering band folding?
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