aalto1 untyped-item.component.html
Signatures of top versus bottom illuminations and their predicted implications for infrared transmission microspectroscopy
Loading...
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Unless otherwise stated, all rights belong to the author. You may download, display and print this publication for Your own personal use. Commercial use is prohibited.
Date
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
Journal of Biophotonics, Volume 17, issue 10
Abstract
Since both top and bottom illuminations are widely used in infrared transmission measurements, in this paper, we study the effects of different illuminations on the signatures in infrared microspectroscopy. By simulating a series of dielectric samples, we show that their extinction efficiency, (Formula presented.), remains unchanged when the direction of the incident plane wave is reversed, even though the field distributions both inside and outside of the sample may be dramatically different. We find features in (Formula presented.) that are correlated with whispering gallery modes for one beam direction and correspond to completely different field distributions for the opposite beam direction. In addition, by linking the optical theorem and the reciprocity relation of far-field scattered field, we rigorously prove the invariance of (Formula presented.) for arbitrary dielectric targets under opposite plane-wave illuminations. Furthermore, we show the difference in the apparent absorbance spectrum for opposite beam directions when considering numerical apertures.
Description
Publisher Copyright: © 2024 The Author(s). Journal of Biophotonics published by Wiley-VCH GmbH.
Other note
Citation
Kong, B, Blümel, R, Ylä-Oijala, P, Wallén, H, Sihvola, A & Kohler, A 2024, 'Signatures of top versus bottom illuminations and their predicted implications for infrared transmission microspectroscopy', Journal of Biophotonics, vol. 17, no. 10, e202400079. https://doi.org/10.1002/jbio.202400079