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Toward Electrically Tunable, Lithography-Free, Ultra-Thin Color Filters Covering
the Whole Visible Spectrum
#MMPMID30054524
Aalizadeh M
; Serebryannikov AE
; Khavasi A
; Vandenbosch GAE
; Ozbay E
Sci Rep
2018[Jul]; 8
(1
): 11316
PMID30054524
show ga
The possibility of real-time tuning of optical devices has attracted a lot of
interest over the last decade. At the same time, coming up with simple
lithography-free structures has always been a challenge in the design of
large-area compatible devices. In this work, we present the concept and the
sample design of an electrically tunable, lithography-free, ultra-thin
transmission-mode color filter, the spectrum of which continuously covers the
whole visible region. A simple Metal-Insulator-Metal (MIM) cavity configuration
is used. It is shown that using the electro-optic dielectric material of
4-dimethyl-amino-N-methyl-4-stilbazoliumtosylate (DAST) as the dielectric layer
in this configuration enables efficient electrical tuning of the color filter.
The total thickness of the structure is 120?nm, so it is ultra-thin. The output
color gets tuned from violet to red by sweeping the applied voltage from -12 to
+12 Volts (V). We present an in-detail optimization procedure along with a simple
calculation method for the resonance wavelength of the MIM cavity that is based
on circuit theory. Such power-efficient structures have a large variety of
potential applications ranging from optical communication and switching to
displays and color-tunable windows.
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