Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 54, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/abd2ee
Keywords
photonic crystals; Bragg diffraction; inverse opals; band-structure; deep ultraviolet diffraction
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Funding
- Department of Science and Technology [DST/TDT/DDP-05/2017]
- IMPRINT project from MHRD
- DRDO, Government of India [4194]
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Characterizing deep ultraviolet diffraction from highly ordered 3D silica inverse opals reveals the presence of photonic stopbands and crystallographic structure, though impacted by cracks and defects. Laser diffraction in the deep UV range exhibits a hexagonally symmetric pattern with a central bright spot, indicating wavelength-dependent concurrent Bragg diffraction and (111) plane symmetry.
Understanding the unexplored deep ultraviolet (UV) diffraction from photonic crystals will pave the way forward for developing diffractive optical elements in the deep UV wavelength range (190-250 nm). Herein we optically characterized the deep UV diffraction from our highly ordered 3D silica inverse opals fabricated by a co-assembly method and calculated their photonic band structures. Presence of a photonic stopband along their Gamma L crystallographic direction is observed from the band structure. Presence of cracks and defects in these inverse opals impacts their deep UV photonic stopbands. Angle dependent diffraction measurements quantify the spacing of the (111) planes in the face-centered cubic inverse opal. Laser diffraction in the deep UV range yields a hexagonally symmetric six-spot pattern surrounding a central bright spot associated with Bragg diffraction in these inverse opals. Unlike earlier work, this feature has been observed with light at multiple wavelengths well within the stopband. Analysis of the deep UV diffraction pattern leads to the possibility of concurrent Bragg diffraction and (111) plane symmetry derived diffraction from our inverse opal PhC that are wavelength dependent.
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