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Mid-IR photothermal beam deflection technique for fast measurement of thermal diffusivity and highly sensitive subsurface imaging
The resonances of phonon and plasmon modes make the absorbance coefficient of materials tremendously high in the mid-infrared spectral range, which allows for a mid-infrared excitation laser to heat the surface layers of these materials with high efficiency. Furthermore, phonon scattering by defects...
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Published in: | Journal of applied physics 2020-05, Vol.127 (17) |
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container_title | Journal of applied physics |
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creator | Younes, J. Harajli, Z. Soueidan, M. Fabrègue, D. Zaatar, Y. Kazan, M. |
description | The resonances of phonon and plasmon modes make the absorbance coefficient of materials tremendously high in the mid-infrared spectral range, which allows for a mid-infrared excitation laser to heat the surface layers of these materials with high efficiency. Furthermore, phonon scattering by defects and defect-induced localized vibrational modes affect the local infrared dielectric function and, hence, the local infrared absorption coefficient. In this paper, we present a mid-infrared photothermal beam deflection technique that takes advantage of the strong interaction between infrared optical excitations and vibrational modes to measure the thermal diffusivity of materials without any sample preparation and takes advantage of the strong dependence of the infrared complex dielectric function on defects to detect subsurface defects with high sensitivity. We demonstrate the importance of the developed technique by measuring the thermal properties of highly transparent and reflective samples and detecting defects undetectable with any of the existing optical methods. Namely, using the developed technique, we find that the thermal diffusivities of high-quality Si, crystalline AlN, and crystalline α-SiO2 substrates are 1.00 ± 0.05, 0.67 ± 0.02, and 0.09 ± 0.01, respectively, and we record highly resolved images of structural subsurface defects as well as defects produced by ion-implantations at a depth of 62 μm under the surfaces of 4H-SiC substrates. |
doi_str_mv | 10.1063/1.5144174 |
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Furthermore, phonon scattering by defects and defect-induced localized vibrational modes affect the local infrared dielectric function and, hence, the local infrared absorption coefficient. In this paper, we present a mid-infrared photothermal beam deflection technique that takes advantage of the strong interaction between infrared optical excitations and vibrational modes to measure the thermal diffusivity of materials without any sample preparation and takes advantage of the strong dependence of the infrared complex dielectric function on defects to detect subsurface defects with high sensitivity. We demonstrate the importance of the developed technique by measuring the thermal properties of highly transparent and reflective samples and detecting defects undetectable with any of the existing optical methods. Namely, using the developed technique, we find that the thermal diffusivities of high-quality Si, crystalline AlN, and crystalline α-SiO2 substrates are 1.00 ± 0.05, 0.67 ± 0.02, and 0.09 ± 0.01, respectively, and we record highly resolved images of structural subsurface defects as well as defects produced by ion-implantations at a depth of 62 μm under the surfaces of 4H-SiC substrates.</description><identifier>ISSN: 0021-8979</identifier><identifier>EISSN: 1089-7550</identifier><identifier>DOI: 10.1063/1.5144174</identifier><identifier>CODEN: JAPIAU</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Absorptivity ; Crystal defects ; Crystal structure ; Crystallinity ; Defects ; Dielectric strength ; Diffusivity ; Excitation ; Infrared absorption ; Infrared lasers ; Infrared spectra ; Optics ; Phonons ; Photothermal deflection spectroscopy ; Physics ; Silicon dioxide ; Silicon substrates ; Strong interactions (field theory) ; Surface layers ; Thermal diffusivity ; Thermodynamic properties</subject><ispartof>Journal of applied physics, 2020-05, Vol.127 (17)</ispartof><rights>Author(s)</rights><rights>2020 Author(s). 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Furthermore, phonon scattering by defects and defect-induced localized vibrational modes affect the local infrared dielectric function and, hence, the local infrared absorption coefficient. In this paper, we present a mid-infrared photothermal beam deflection technique that takes advantage of the strong interaction between infrared optical excitations and vibrational modes to measure the thermal diffusivity of materials without any sample preparation and takes advantage of the strong dependence of the infrared complex dielectric function on defects to detect subsurface defects with high sensitivity. We demonstrate the importance of the developed technique by measuring the thermal properties of highly transparent and reflective samples and detecting defects undetectable with any of the existing optical methods. Namely, using the developed technique, we find that the thermal diffusivities of high-quality Si, crystalline AlN, and crystalline α-SiO2 substrates are 1.00 ± 0.05, 0.67 ± 0.02, and 0.09 ± 0.01, respectively, and we record highly resolved images of structural subsurface defects as well as defects produced by ion-implantations at a depth of 62 μm under the surfaces of 4H-SiC substrates.</description><subject>Absorptivity</subject><subject>Crystal defects</subject><subject>Crystal structure</subject><subject>Crystallinity</subject><subject>Defects</subject><subject>Dielectric strength</subject><subject>Diffusivity</subject><subject>Excitation</subject><subject>Infrared absorption</subject><subject>Infrared lasers</subject><subject>Infrared spectra</subject><subject>Optics</subject><subject>Phonons</subject><subject>Photothermal deflection spectroscopy</subject><subject>Physics</subject><subject>Silicon dioxide</subject><subject>Silicon substrates</subject><subject>Strong interactions (field theory)</subject><subject>Surface layers</subject><subject>Thermal diffusivity</subject><subject>Thermodynamic properties</subject><issn>0021-8979</issn><issn>1089-7550</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNqdkUtLLDEQhYNcwfGx8B8EXCm0VnX6Mb0U8QUjgug6pNOV6Uh3Z0zSA7P0n9vD-NjfVUHx1amqcxg7RbhEKMQVXuaYZVhme2yGMK-SMs_hH5sBpJjMq7I6YIchvAMgzkU1Y59PtkkeX_iqddHFlnyvOl6T6nlDpiMdrRt4JN0O9mMkbpznRoXIe1Jh9NTTELkz_GeyscaMwa5t3HA1NLy1y7bb8EBDsNGuiYexnuaM0sRtr5Z2WB6zfaO6QCff9Yi93d2-3jwki-f7x5vrRaKztIxJTVWaFbqoq1RXWkFpKAXQWGCuDVFTQlpqZUxRgMkMAuQoVAG6yqCpdU3iiJ3vdFvVyZWftvuNdMrKh-uF3PZAiGIOZbbGiT3bsSvvprdDlO9u9MN0nkzFZCKKPE__FLV3IXgyv7IIcpuGRPmdxsRe7NigbVRbV_8PXjv_B8pVY8QXpQ6abQ</recordid><startdate>20200507</startdate><enddate>20200507</enddate><creator>Younes, J.</creator><creator>Harajli, Z.</creator><creator>Soueidan, M.</creator><creator>Fabrègue, D.</creator><creator>Zaatar, Y.</creator><creator>Kazan, M.</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>1XC</scope><orcidid>https://orcid.org/0000-0002-8263-5397</orcidid><orcidid>https://orcid.org/0000-0002-0962-5133</orcidid></search><sort><creationdate>20200507</creationdate><title>Mid-IR photothermal beam deflection technique for fast measurement of thermal diffusivity and highly sensitive subsurface imaging</title><author>Younes, J. ; 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Furthermore, phonon scattering by defects and defect-induced localized vibrational modes affect the local infrared dielectric function and, hence, the local infrared absorption coefficient. In this paper, we present a mid-infrared photothermal beam deflection technique that takes advantage of the strong interaction between infrared optical excitations and vibrational modes to measure the thermal diffusivity of materials without any sample preparation and takes advantage of the strong dependence of the infrared complex dielectric function on defects to detect subsurface defects with high sensitivity. We demonstrate the importance of the developed technique by measuring the thermal properties of highly transparent and reflective samples and detecting defects undetectable with any of the existing optical methods. Namely, using the developed technique, we find that the thermal diffusivities of high-quality Si, crystalline AlN, and crystalline α-SiO2 substrates are 1.00 ± 0.05, 0.67 ± 0.02, and 0.09 ± 0.01, respectively, and we record highly resolved images of structural subsurface defects as well as defects produced by ion-implantations at a depth of 62 μm under the surfaces of 4H-SiC substrates.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.5144174</doi><tpages>13</tpages><orcidid>https://orcid.org/0000-0002-8263-5397</orcidid><orcidid>https://orcid.org/0000-0002-0962-5133</orcidid></addata></record> |
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source | American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list) |
subjects | Absorptivity Crystal defects Crystal structure Crystallinity Defects Dielectric strength Diffusivity Excitation Infrared absorption Infrared lasers Infrared spectra Optics Phonons Photothermal deflection spectroscopy Physics Silicon dioxide Silicon substrates Strong interactions (field theory) Surface layers Thermal diffusivity Thermodynamic properties |
title | Mid-IR photothermal beam deflection technique for fast measurement of thermal diffusivity and highly sensitive subsurface imaging |
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