TY - BOOK
T1 - Light Manipulation in Multilayer Metamaterials
AU - Habib, Mohsin
PY - 2022
Y1 - 2022
N2 - Light manipulation has become much more sophisticated with the
development of artificial metamaterials. Here, I have studied multilayer
thin film-based hyperbolic metamaterials (HMM) in both planar and
cylindrical formations. First, the planar HMMs are used as
epsilon-near-zero (ENZ) substrates to control the spectral position of
plasmonic resonance. The resonance shift is reduced three times on top
of HMM compared to a glass substrate. Next, the thin films are rolled to
form three-dimensional (3D) rolled-up tubes (RUT) using a strained
induced self-rolling mechanism. The RUTs offer flexibility to use a
broad range of materials for rolling by using photoresist and germanium
as a sacrificial layer. The RUTs are fabricated with different diameters
ranging from ∼1 µm to 10 µm by simply changing the
thicknesses of dielectric and metal layers. The walls of the RUTs offer
tunable material dispersion and can be used as 3D ENZ metamaterials.
While, the core of these RUTs can be used as waveguides, which can
support the ENZ mode. The modeling manifests that the material
dispersion is a function of the thicknesses of the layers and the number
of turns and ENZ mode is very sensitive to the diameter of the RUT.
Finally, the upper side of the RUT is patterned to form 3D fishnet
metamaterials, which exhibit a negative index of refraction in the
near-infrared region with low loss and a better figure of merit. The
patterning is further upgraded to form nanohole-based metasurfaces that
can control the wavefront of light. The curved metasurfaces out-perform
the conventional planar metasurfaces. The large diameter of RUTs
provides enough area to pattern a good number of unit cells, that can be
optically characterized. The results of this thesis show that the
planar HMMs can be used to effectively reduce the fabrication error for
advanced metasurfaces and plasmonic applications. The cylindrical HMMs
can serve as a unique platform for 3D metamaterials suitable for sensing
applications, trapping biological cells, neurons, and optical trapping
of particles.
AB - Light manipulation has become much more sophisticated with the
development of artificial metamaterials. Here, I have studied multilayer
thin film-based hyperbolic metamaterials (HMM) in both planar and
cylindrical formations. First, the planar HMMs are used as
epsilon-near-zero (ENZ) substrates to control the spectral position of
plasmonic resonance. The resonance shift is reduced three times on top
of HMM compared to a glass substrate. Next, the thin films are rolled to
form three-dimensional (3D) rolled-up tubes (RUT) using a strained
induced self-rolling mechanism. The RUTs offer flexibility to use a
broad range of materials for rolling by using photoresist and germanium
as a sacrificial layer. The RUTs are fabricated with different diameters
ranging from ∼1 µm to 10 µm by simply changing the
thicknesses of dielectric and metal layers. The walls of the RUTs offer
tunable material dispersion and can be used as 3D ENZ metamaterials.
While, the core of these RUTs can be used as waveguides, which can
support the ENZ mode. The modeling manifests that the material
dispersion is a function of the thicknesses of the layers and the number
of turns and ENZ mode is very sensitive to the diameter of the RUT.
Finally, the upper side of the RUT is patterned to form 3D fishnet
metamaterials, which exhibit a negative index of refraction in the
near-infrared region with low loss and a better figure of merit. The
patterning is further upgraded to form nanohole-based metasurfaces that
can control the wavefront of light. The curved metasurfaces out-perform
the conventional planar metasurfaces. The large diameter of RUTs
provides enough area to pattern a good number of unit cells, that can be
optically characterized. The results of this thesis show that the
planar HMMs can be used to effectively reduce the fabrication error for
advanced metasurfaces and plasmonic applications. The cylindrical HMMs
can serve as a unique platform for 3D metamaterials suitable for sensing
applications, trapping biological cells, neurons, and optical trapping
of particles.
M3 - Doctoral thesis
SN - 978-952-03-2450-6
T3 - Tampere University Dissertations - Tampereen yliopiston väitöskirjat
BT - Light Manipulation in Multilayer Metamaterials
PB - Tampere University
CY - Tampere
ER -