Numerical simulation of internal electric field distribution in colloidal photonic crystal thin films
We have computed the internal electric field distribution in monolayer, bilayer, and trilayer colloidal photonic crystal thin films on a glass substrate. The field distributions are evaluated on the top photonic crystal layer under the effects of additional layers along the direction of light propag...
Saved in:
| Published in: | Optics communications 2023-02, Vol.528, p.129026, Article 129026 |
|---|---|
| Main Authors: | , , , |
| Format: | Article |
| Language: | eng |
| Subjects: | |
| Online Access: | Get full text |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | We have computed the internal electric field distribution in monolayer, bilayer, and trilayer colloidal photonic crystal thin films on a glass substrate. The field distributions are evaluated on the top photonic crystal layer under the effects of additional layers along the direction of light propagation We have also investigated the field distributions in photonic crystal thin films at on-resonance and off-resonance incident wavelengths. The calculated reflection and transmission spectra of photonic crystal thin films help us choose the right wavelengths for determining the on-resonance and off-resonance conditions. The electric fields across different regions in the crystal plane are evaluated for a quantitative understanding of the field distribution. We have observed that the internal electric field gets redistributed in the plane of a close-packed periodic array of colloids. Our results reveal that the internal electric field is localized and enhanced in the air void region between the dielectric spheres with nearly the same maximum field values for the on-resonance wavelength. We have observed that at off-resonance wavelength, the field gets localized within the dielectric sphere region for the monolayer and bilayer cases. Contrastingly, the field distribution in the trilayer case forms a connecting network within the photonic crystal plane. Under off-resonance wavelength, the trilayer shows a huge enhancement in maximum field values compared to the monolayer and bilayer thin films. These results promise to employ photonic crystal thin films of colloidal dielectric spheres as templates for sensing applications using the surfaced enhanced Raman scattering technique. |
|---|---|
| ISSN: | 0030-4018 1873-0310 |