Available Research Topics:
-
Nonlinear Optics in photonic crystals
-
Hybrid simulation method for optical resonators
-
Antenna Design and fabrication
-
Radar cross section computation for very large bodies
-
Microwave modeling of photonic crystals
-
Linear and nonlinear optical properties for metallic photonic crystals
-
Theory of near field and quantum optics close to photonic crystal structure
Hollow-core Photonic Crystal Fiber
Voltage-tunable Terahertz Detectors
Tunable Antenna-coupled Intersubband Terahertz Mixers
Photonic Crystals (PhCs) are artificially created
periodic structures used in photonics which
ensemble the atomic structure for electrons.
Slow light propagation in PhCs provides a great
opportunity for enhancement of nonlinear modulation of light.
This feature of PhCs is a promising approach for all-optical
processing of light. The key interest of the group in
this area is to enhance the previously developed
numerical techniques to analyze rather realistic
nonlinear wave propagation in PhCs.
Optical micro-resonators have demonstrated great
promise as fundamental building blocks for a
variety of applications in photonics.
Recent advances in materials technology and
nano-fabrication techniques have led to the
utilization of non-linear optical properties
in different optical resonators.
In turn this has increased the need for a
coupled quantum mechanical and electromagnetic
model to accurately simulate the dynamics of these novel structures.
Numerical simulations provide a framework
for quick and low cost feasibility studies
and allow for design optimization before
devices are fabricated, furthermore accurate
simulations can provide a detailed understanding
of the complex physical phenomena inherent
in optical micro-cavities.
Combining finite difference time domain
with rate equations for gain media is met
in the literature to some extents, but the treatments
demands more accurate attention specially in modeling
optical noise phenomenon. This is quiet important
in ultra-low energy processes occurring in optical resonators.
We here seek a hybrid method for fast and
accurate modeling of optical micro-resonator
based devices both on silicon and photonic crystal structures.
The method that could be a combination of modal
transmission method, beam propagation method and
FDTD would be coupled to the quantum mechanical
equations to model different nonlinear phenomena.
Antenna Design and fabrication is a long
standing need for military and civil
communication systems. Different antenna
structures are designed, optimized and fabricated
in our group. These are in different frequency
bands (from HF to Ku) for versatile
application (from HFSWR radars to onboard antennas).
We are now working toward novel algorithms for mutual
cancellation for adaptive null-steering antenna arrays.
All radar applications need reasonable predictions
of the target backscattering. Such electromagnetic
predictions are quite challenging for large and
complex objects.
We have been recently applying Physical
optics approximation in line with physical
theory of diffraction and geometrical optics
on general curved surfaces.
The ability to deal with curved
surfaces (represented by non-uniform B-Splines)
provides an unprecedented decrease in computational
costs for very large targets.