Infrared blocking materials
AlN thin films on the flexible polymeric Teflon and Mylar substrates show characteristics of efficient infrared (IR)
 blocking filters (IR “stealth”). They can suppress heat flows from the warm parts of objects (T ~ 300÷500 K) and
 block IR radiation from them, but are transparent in...
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Видавничий дім "Академперіодика" НАН України
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| Cite this: | Infrared blocking materials / Z.F. Tsybrii, F.F. Sizov, A.G. Golenkov // Доповіді Національної академії наук України. — 2020. — № 2. — С. 24-28. — Бібліогр.: 3 назв. — англ. |
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| author | Tsybrii, Z.F. Sizov, F.F. Golenkov, A.G. |
| author_facet | Tsybrii, Z.F. Sizov, F.F. Golenkov, A.G. |
| citation_txt | Infrared blocking materials / Z.F. Tsybrii, F.F. Sizov, A.G. Golenkov // Доповіді Національної академії наук України. — 2020. — № 2. — С. 24-28. — Бібліогр.: 3 назв. — англ. |
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| description | AlN thin films on the flexible polymeric Teflon and Mylar substrates show characteristics of efficient infrared (IR)
blocking filters (IR “stealth”). They can suppress heat flows from the warm parts of objects (T ~ 300÷500 K) and
block IR radiation from them, but are transparent in visible, microwave, and THz spectral regions in contrast to
special paints that demonstrate a relatively high emissivity in the IR spectral range
Тонкі плівки AlN на гнучких полімерних підкладках тефлону та майла у характеризуються властивостями ефективних інфрачервоних (ІЧ) блокуючих фільтрів. Вони можуть придушувати теплові потоки
від гарячих частин об'єктів (T ~ 300ч500 K) і блокувати ІЧ випромінювання від них, але є прозорими у
видимому, мікрохвильовому та ТГц спектральних діапазонах на відміну від спеціальних фарб, що демонструють відносно високу випромінювальну здатність в ІЧ області спектра.
Тонкие пленки AlN на гибких полимерных подложках тефлона и майлара характеризуются свойствами
эффективных инфракрасных (ИК) блокирующих фильтров. Они могут подавлять тепловые потоки от
нагретых частей объектов (T ~ 300ч500 K) и блокировать ИК излучение от них, но являются прозрачными
в видимом, микроволновом и ТГц спектральных диапазонах в отличии от специальных красок, которые
демонстрируют относительно высокую излучательную способность в ИК области спектра.
|
| first_indexed | 2025-12-07T16:30:00Z |
| format | Article |
| fulltext |
24
ОПОВІДІ
НАЦІОНАЛЬНОЇ
АКАДЕМІЇ НАУК
УКРАЇНИ
ISSN 10256415. Dopov. Nac. akad. nauk Ukr. 2020. № 2: 24—28
Many modern optical imaging and detection systems operate not only in the visible, but in the
infrared (IR), radio wave, and mm (subTHz) spectral ranges. The rapid development of such
systems requires the development of means of masking (suppression) of signals, for example,
in the infrared region of the spectrum. Infrared blocking filters are also crucial for controlling
the radiation load on cryogenic systems and optimizing the sensitivity of bolometric detectors
in the far infrared region of the spectrum. In this case, the filters should minimize the radiation
load on the cryogenic system, have a high thermal conductivity for heat sinks, avoid the rera
diation, and be transparent in the THz spectrum.
In this work, a comparative analysis of the distribution of thermal fields of two types of
masking coatings — special paint and composite structure based on aluminum nitride — is car
ried out. It is shown that the latter can be more efficient IR filter elements due to the AlN cha
rac teristic band of residual rays (Reststrahlen band, almost 100 % reflection) in the spectral
range of 5—25 µm, where the main part of the radiation power of a black body at 300K is con
centrated.
“Coverblocking IR” paints. It is well known that any paint in IR spectral range has emi
ssivity from ε ≈ 0.84 (plastic, white) to ε ≈ 0.94—0.97 (oil, various colors) [1]. Still, from time
to time there are advanced offers proposing different kinds of paints that presumably can dimi
nish an object visibility in the IR. Here a comparison of one of such paints with ordinary gray oil
paint in the visible and IR spectral ranges was made. In visible, really, such experimental paint
that covers a part of metallic sheet can reduce the visibility of object (see Fig. 1) but in the IR,
© Z.F. Tsybrii, F.F. Sizov, A.G. Golenkov, 2020
https://doi.org/10.15407/dopovidi2020.02.024
UDC 5351
Z.F. Tsybrii, F.F. Sizov, A.G. Golenkov
V.E. Lashkaryov Institute of Semiconductor Physics of the NAS of Ukraine, Kyiv
Email: tsybrii@isp.kiev.ua
Infrared blocking materials
Presented by Corresponding Member of the NAS of Ukraine F.F. Sizov
AlN thin films on the flexible polymeric Teflon and Mylar substrates show characteristics of efficient infrared (IR)
blocking filters (IR “stealth”). They can suppress heat flows from the warm parts of objects (T ∼ 300÷500 K) and
block IR radiation from them, but are transparent in visible, microwave, and THz spectral regions in contrast to
special paints that demonstrate a relatively high emissivity in the IR spectral range
Keywords: IR blocking, AlN, filters, paints.
ФІЗИКА
25ISSN 10256415. Допов. Нац. акад. наук Укр. 2020. № 2
Infrared blocking materials
contrary, its emissivity is growing substantially leading to large IR visibility by IR cameras
compared to noncovered with paint metal surface and is equal to emissivity of ordinary gray oil
paint (see Fig. 2). Images (Fig. 1 and Fig. 2) were obtained using a Mikron M7800 IR camera
(λ = 7.5÷14 µm) with a temperature resolution of ∆T = 60 mK and simultaneously recording
objects in the visible spectral range.
The visible images of investigated metallic sheet with paints at the temperatures Т ∼ 20 °С
and Т ∼ 60 °С are not different. But, when using the IR camera, the distribution of thermal fields
from the uncovered part of the metal plate and covered with paints differ. As can be seen from
Fig. 2, when the plate is heated to the temperature T = 64,9 °С, the paintcovered parts of
the metal plate have an effective thermal temperature of T = 62,2 °С, which is only 2,7 °С lower
than the surface temperature of the heated plate.
IR blocking filters. The IR blocking filters based on AlN nanostructured thin films deposited
on different polymeric substrates, particularly on the Teflon and Mylar films, by the lowtemper
ature ionplasma technique, are investigated. Due to the location of the residual band of AlN
(Restrahlend band, almost 100 % reflection [2]), nanostructured surface morphology peculiari
Fig. 1. A metallic sheet with uncovered polished part (a), experimental paint (b),
and ordinary gray oil paint (c) on the top of a hot plate, visible photos
Fig. 2. IR image of a metallic sheet with uncovered polished part (a), experimental paint (b), and ordinary gray
oil paint (c) on the top of a hot plate heated to the temperature T = 64.9 °С (1) and distribution of the effective
temperature along line “1” (2) obtained with a Mikron M7800 IR camera
26 ISSN 10256415. Dopov. Nac. akad. nauk Ukr. 2020. № 2
Z.F. Tsybrii, F.F. Sizov, A.G. Golenkov
ties, and the high thermal conductivity (γ ≈ 134÷180 W/m ⋅ K), such thin films composite struc
tures effectively block an IR radiation from the wavelengths 10.3 microns up to almost 20 mic
rons [3]. Fig. 3 demonstrates the IR image of woman’s face behind the AlN/Mylar filter. As it can
see from Fig. 3, a, this blocking filter has well masking characteristics in the IR spectral range.
From the analysis of the curve (Fig. 3, b),we obtain the reduction in the temperature along
line “1” from 31.7 °C (on the hand) to 22.4 °C (at the center of the filter). However, the tempera
ture distribution along line “1” (Fig. 3, b) on the segment lying in the filter plane is characterized
by a slight temperature gradient. This can be explained by the insignificant nonuniformity of the
thickness of the AlN coating, when synthesized on polymeric substrates of a larger area.
For comparison with the experimental paint (Fig. 2), the thermal image of a hot plate heated
to T = 61.8 °C in vertical position with using an AlN / Mylar filter and a plastic mesh to form an
air gap between the heated object and the filter is presented in Fig. 4.
Fig. 4 shows the efficiency of an AlN / Mylar filter that significantly reduces the effective
temperature of the heated object from T = 61.8 °C to T = 30.7 °C.
Fig. 3. IR image of woman’s face behind the AlN/Mylar filter (a) and distribution of
the effective temperature along line “1” (b) obtained with a Mikron M7800 IR ca
mera (temperature resolution is ∆T = 60 mK)
Fig. 4. IR image of the hot plate heated to T = 61.8 °C with using an AlN / Mylar
filter and a plastic mesh (a) and distribution of the effective temperature along line
“1” (b) obtained with a Mikron M7800 IR camera (temperature resolution is ∆T =
= 60 mK).
27ISSN 10256415. Допов. Нац. акад. наук Укр. 2020. № 2
Infrared blocking materials
The use of polymeric films of Mylar and Teflon as substrates made it possible to evaluate
the potential of an AlN / Mylar (Teflon) film structures to obtain filters that block IR radiation
and transmit subTHz/THz radiation, for example, for highly sensitive cooled detectors. To esti
mate the transmittance of the radiation intensity with a frequency of 140 GHz, we use a simplified
model. We will assume that plane waves interfere. Let the incident wave that falls on the detector
for the first time have the amplitude of the electrical component E1. Let the amplitude of a wave
reflected from the surface of the detector, reflected from the source, and again falling on the de
tector have the amplitude E2. The following many multiple reflections will be neglected to faci
litate the consideration. We will also assume that, at small displacements along the optical axis,
the amplitudes E1 and E2 do not change, only the phase of these waves changes. Then the maxi
mum of the power will be observed, if these two waves are in the phase Pmax = α (E1 + E2)2, res
pectively, the minimum — when in the antiphase Pmin = α (E1 — E2)2, where α is the dimension
coefficient. When the investigated structure overlaps the output of the horn antenna of the sour
ce, the maximum and minimum conditions can be written as
PТ
max = α (η
1/2E1 + µ1/2 η3/2 E2)2, (1)
PТ
min = α (η
1/2E1 — µ1/2 η3/2 E2)2, (2)
where η is the transmittance of the radiation through the structure, and µ is the reflectance of
the radiation from the detector and the source. We define η from Eqs. (1) and (2):
2
min max
min max
T TP P
P P
+
η =
+
. (3)
The calculations of the transmittance coefficient according to formula (3) showed that, for an
AlN / Mylar samples η ≈85÷90 % in subTHz spectral range (140—280 GHz).
Conclusions.The distribution of thermal fields in structures based on layers with different
coefficients of thermal conductivity (AlN / Mylar) in the spectral range of 8—14 µm with a re
solution of 60 mK is experimentally investigated and compared with the experimental “Co
verblocking IR” paint. An analysis of obtained thermal images and their temperature distri
butions with the use of AlN / Mylar filters demonstrates an effective temperature reduction
by ≈ 9.3 °C for living objects at room temperature. The effectiveness of the suppression of infra
red radiation by such filters and paints in the application to heated objects has been studied. It
is shown that the AlN/Mylar filters demonstrate the better masking characteristics in the IR
spectrum (the temperature contrast is ∼ 30 °C with using an air gap) in contrast to experimental
paint, where the temperature contrast is only 2.7 °C (and much smaller compared to the unpain
ted metal surface, ∆T ≈ 40 °C).
AlN / Mylar filters showed a good transparency in the subTHz spectral region. They can
improve the performance of THz lowtemperature detectors by supressing the parasitic back
ground IR radiation.
28 ISSN 10256415. Dopov. Nac. akad. nauk Ukr. 2020. № 2
Z.F. Tsybrii, F.F. Sizov, A.G. Golenkov
REFERENCES
1. https://www.thermoworks.com/emissivitytable.
2. Antonova, K., Szekeres, A., Duta, L., Stan, G. E., Mihailescu, N. & Mihailescu, I. N. (2016). Orientation of the
nanocrystallites in AlN thin film determined by FTIR spectroscopy. J. Phys.: Conf. Ser., 682, 012024.
3. Rudenko, E., Tsybrii, Z., Sizov, F., Korotash, I., Polotskiy, D., Skoryk, M., Vuichyk, M. & Svezhentsova, K.
(2017). Infrared blocking, microwave and terahertz lowloss transmission AlN films grown on flexible poly
meric substrates. J. Appl. Phys., 121, 135304.
Received 06.12.2019
З.Ф. Цибрій, Ф.Ф. Сизов, О.Г. Голенков
Інститут фізики напівпровідників ім. В.Є. Лашкарьова НАН України, Київ
Еmail: tsybrii@isp.kiev.ua
МАТЕРІАЛИ, ЯКІ БЛОКУЮТЬ ІНФРАЧЕРВОНЕ ВИПРОМІНЮВАННЯ
Тонкі плівки AlN на гнучких полімерних підкладках тефлону та майлару характеризуються властивос
тями ефективних інфрачервоних (ІЧ) блокуючих фільтрів. Вони можуть придушувати теплові потоки
від гарячих частин об’єктів (T ~ 300÷500 K) і блокувати ІЧ випромінювання від них, але є прозорими у
видимому, мікрохвильовому та ТГц спектральних діапазонах на відміну від спеціальних фарб, що де
монструють відносно високу випромінювальну здатність в ІЧ області спектра.
Ключові слова: ІЧ блокуючий, AlN, фільтри, фарби.
З.Ф. Цибрий, Ф.Ф. Сизов, А.Г. Голенков
Институт физики полупроводников им. В.Е. Лашкарева НАН Украины, Киев
Еmail: tsybrii@isp.kiev.ua
МАТЕРИАЛЫ, БЛОКИРУЮЩИЕ ИНФРАКРАСНОЕ ИЗЛУЧЕНИЕ
Тонкие пленки AlN на гибких полимерных подложках тефлона и майлара характеризуются свойствами
эффективных инфракрасных (ИК) блокирующих фильтров. Они могут подавлять тепловые потоки от
нагретых частей объектов (T ~ 300÷500 K) и блокировать ИК излучение от них, но являются прозрачными
в видимом, микроволновом и ТГц спектральных диапазонах в отличии от специальных красок, которые
демонстрируют относительно высокую излучательную способность в ИК области спектра.
Ключевые слова: ИК блокирующий, AlN, фильтры, краски.
|
| id | nasplib_isofts_kiev_ua-123456789-170332 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1025-6415 |
| language | English |
| last_indexed | 2025-12-07T16:30:00Z |
| publishDate | 2020 |
| publisher | Видавничий дім "Академперіодика" НАН України |
| record_format | dspace |
| spelling | Tsybrii, Z.F. Sizov, F.F. Golenkov, A.G. 2020-07-11T18:38:22Z 2020-07-11T18:38:22Z 2020 Infrared blocking materials / Z.F. Tsybrii, F.F. Sizov, A.G. Golenkov // Доповіді Національної академії наук України. — 2020. — № 2. — С. 24-28. — Бібліогр.: 3 назв. — англ. 1025-6415 DOI: doi.org/10.15407/dopovidi2020.02.024 https://nasplib.isofts.kiev.ua/handle/123456789/170332 5351 AlN thin films on the flexible polymeric Teflon and Mylar substrates show characteristics of efficient infrared (IR)
 blocking filters (IR “stealth”). They can suppress heat flows from the warm parts of objects (T ~ 300÷500 K) and
 block IR radiation from them, but are transparent in visible, microwave, and THz spectral regions in contrast to
 special paints that demonstrate a relatively high emissivity in the IR spectral range Тонкі плівки AlN на гнучких полімерних підкладках тефлону та майла у характеризуються властивостями ефективних інфрачервоних (ІЧ) блокуючих фільтрів. Вони можуть придушувати теплові потоки
 від гарячих частин об'єктів (T ~ 300ч500 K) і блокувати ІЧ випромінювання від них, але є прозорими у
 видимому, мікрохвильовому та ТГц спектральних діапазонах на відміну від спеціальних фарб, що демонструють відносно високу випромінювальну здатність в ІЧ області спектра. Тонкие пленки AlN на гибких полимерных подложках тефлона и майлара характеризуются свойствами
 эффективных инфракрасных (ИК) блокирующих фильтров. Они могут подавлять тепловые потоки от
 нагретых частей объектов (T ~ 300ч500 K) и блокировать ИК излучение от них, но являются прозрачными
 в видимом, микроволновом и ТГц спектральных диапазонах в отличии от специальных красок, которые
 демонстрируют относительно высокую излучательную способность в ИК области спектра. en Видавничий дім "Академперіодика" НАН України Доповіді НАН України Фізика Infrared blocking materials Матеріали, які блокують інфрачервоне випромінювання Материалы, блокирующие инфракрасное излучение Article published earlier |
| spellingShingle | Infrared blocking materials Tsybrii, Z.F. Sizov, F.F. Golenkov, A.G. Фізика |
| title | Infrared blocking materials |
| title_alt | Матеріали, які блокують інфрачервоне випромінювання Материалы, блокирующие инфракрасное излучение |
| title_full | Infrared blocking materials |
| title_fullStr | Infrared blocking materials |
| title_full_unstemmed | Infrared blocking materials |
| title_short | Infrared blocking materials |
| title_sort | infrared blocking materials |
| topic | Фізика |
| topic_facet | Фізика |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/170332 |
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