Fabrication of voxelized chirel nanophotonic devices with circular dichroism
Ackerman, Liam
This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/110280
Description
Title
Fabrication of voxelized chirel nanophotonic devices with circular dichroism
Chirality is a commonly found property in objects and light waves. An object with an asymmetric
geometry has the property of chirality, in which its image cannot be superposed on itself. Circularly
polarized light waves come in the variants of left-handed and right-handed polarization, which
correspond to their chiral geometry. When circularly polarized light interacts with a chiral structure,
the light absorbed will have a differential variation based on the handedness of the wave, known
as the circular dichroism (CD). For this project, a voxelized titanium-dioxide (TiO2) structure
is fabricated for the purpose of producing a significantly noticeable circular dichroism. A TiO2
substrate is patterned with an array of 100 nm by 100 nm voxels with varying heights to produce an
asymmetric structure. The asymmetry found in the array basis defines the chirality of the structure
and produces a variation in the output’s intensity. This intensity variation is what determines the CD
of the device. The fabrication of this voxelized array is a continuation of the ideas found in the lab’s
previous work on voxelized topology optimization. The fabrication of a passive chiral-nanophotonic
structure with a large CD has potential to serve as an optical polarization filter and a wavelength
selector for superposed waves.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.