Frequency selective surfaces for terahertz applications
Author(s)
Advisor
Date
2015Publisher
Bilkent University
Language
English
Type
ThesisItem Usage Stats
125
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Abstract
This thesis presents Terahertz (THz) Frequency selective surfaces (FSS) that can
be realized using standard microfabrication techniques. These FSS structures are
designed for frequencies around 0.8 THz, which is a crucial operating frequency in
security and medical imaging. Using THz waves for such applications, multilayer
frequency selective surfaces are preferred due to their wide
at band response,
lower dependency to angle of incidence, and low loss. The implementation of
such structures requires very thin layers of substrates and membranes in order to
improve the performance in THz regime. In order to alleviate the di culty in the
implementation of multilayer structures, a fabrication process is proposed where
a 100 m-thick glass membrane is formed through HF etching of a 500 m-thick
glass wafer. Using this fabrication process, three separate designs consisting
of single-layer FSS are investigated using high frequency structural simulator
(HFSS). The rst design, consists of a circular ring slot in a square metallic
structure on top of a 100 m-thick Pyrex glass membrane with 95% transmission
bandwidth of approximately 0.042 THz , which remains nearly constant till 30o
angle of incidence. The second design consists of a tripole structure on top of
a 100 m-thick Pyrex glass membrane with nearly 95% transmission bandwidth
of 0.015 THz, which remains nearly constant till 30o angle of incidence. The
third structure consists of a triangular ring slot in a square metal on top of a 100
m-thick Pyrex glass membrane with 95% transmission bandwidth of 0.015 THz,
which remains nearly constant upto 20o angle of incidence. These designs show
that the re
ections from samples can be reduced compared to the conventional
sample holders used in THz spectroscopy applications; by using single layer FSS
structures manufactured through a relatively simple fabrication process.
Keywords
FSSBand-pass filters
Band-stop filters
Low pass filters
High pass filters
Spatial filters
Absorbers
Terahertz
Permalink
http://hdl.handle.net/11693/17183Collections
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