Effect of elevated substrate temperature deposition on the mechanical losses in tantala thin film coatings

G Vajente, Ross Birney, A Ananyeva, S Angelova, R Asselin, B Baloukas, R Bassiri, G Billingsley, M M Fejer, D Gibson, L J Godbout, E Gustafson, A Heptonstall, J Hough, S MacFoy, A Markosyan, I W Martin, L Martinu, P G Murray, S Penn & 8 others S Roorda, S Rowan, F Schiettekatte, R Shink, C Torrie, D Vine, Stuart Reid, R X Adhikari

Research output: Contribution to journalArticle

Abstract

Brownian thermal noise in dielectric multilayer coatings limits the sensitivity of current and future interferometric gravitational wave detectors. In this work we explore the possibility of improving the mechanical losses of tantala, often used as the high refractive index material, by depositing it on a substrate held at elevated temperature. Promising results have been previously obtained with this technique when applied to amorphous silicon. We show that depositing tantala on a hot substrate reduced the mechanical losses of the as-deposited coating, but subsequent thermal treatments had a larger impact, as they reduced the losses to levels previously reported in the literature. We also show that the reduction in mechanical loss correlates with increased medium range order in the atomic structure of the coatings using x-ray diffraction and Raman spectroscopy. Finally, a discussion is included on our results, which shows that the elevated temperature deposition of pure tantala coatings does not appear to reduce mechanical loss in a similar way to that reported in the literature for amorphous silicon; and we suggest possible future research directions.
Original languageEnglish
Article number075001
JournalClassical and Quantum Gravity
Volume35
Issue number7
DOIs
Publication statusPublished - 23 Feb 2018

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coatings
thin films
amorphous silicon
temperature
thermal noise
atomic structure
gravitational waves
x ray diffraction
Raman spectroscopy
refractivity
sensitivity
detectors
spectroscopy

Cite this

Vajente, G ; Birney, Ross ; Ananyeva, A ; Angelova, S ; Asselin, R ; Baloukas, B ; Bassiri, R ; Billingsley, G ; Fejer, M M ; Gibson, D ; Godbout, L J ; Gustafson, E ; Heptonstall, A ; Hough, J ; MacFoy, S ; Markosyan, A ; Martin, I W ; Martinu, L ; Murray, P G ; Penn, S ; Roorda, S ; Rowan, S ; Schiettekatte, F ; Shink, R ; Torrie, C ; Vine, D ; Reid, Stuart ; Adhikari, R X. / Effect of elevated substrate temperature deposition on the mechanical losses in tantala thin film coatings. In: Classical and Quantum Gravity. 2018 ; Vol. 35, No. 7.
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abstract = "Brownian thermal noise in dielectric multilayer coatings limits the sensitivity of current and future interferometric gravitational wave detectors. In this work we explore the possibility of improving the mechanical losses of tantala, often used as the high refractive index material, by depositing it on a substrate held at elevated temperature. Promising results have been previously obtained with this technique when applied to amorphous silicon. We show that depositing tantala on a hot substrate reduced the mechanical losses of the as-deposited coating, but subsequent thermal treatments had a larger impact, as they reduced the losses to levels previously reported in the literature. We also show that the reduction in mechanical loss correlates with increased medium range order in the atomic structure of the coatings using x-ray diffraction and Raman spectroscopy. Finally, a discussion is included on our results, which shows that the elevated temperature deposition of pure tantala coatings does not appear to reduce mechanical loss in a similar way to that reported in the literature for amorphous silicon; and we suggest possible future research directions.",
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Vajente, G, Birney, R, Ananyeva, A, Angelova, S, Asselin, R, Baloukas, B, Bassiri, R, Billingsley, G, Fejer, MM, Gibson, D, Godbout, LJ, Gustafson, E, Heptonstall, A, Hough, J, MacFoy, S, Markosyan, A, Martin, IW, Martinu, L, Murray, PG, Penn, S, Roorda, S, Rowan, S, Schiettekatte, F, Shink, R, Torrie, C, Vine, D, Reid, S & Adhikari, RX 2018, 'Effect of elevated substrate temperature deposition on the mechanical losses in tantala thin film coatings' Classical and Quantum Gravity, vol. 35, no. 7, 075001. https://doi.org/10.1088/1361-6382/aaad7c

Effect of elevated substrate temperature deposition on the mechanical losses in tantala thin film coatings. / Vajente, G; Birney, Ross; Ananyeva, A; Angelova, S; Asselin, R; Baloukas, B; Bassiri, R; Billingsley, G; Fejer, M M; Gibson, D; Godbout, L J; Gustafson, E; Heptonstall, A; Hough, J; MacFoy, S; Markosyan, A; Martin, I W; Martinu, L; Murray, P G; Penn, S; Roorda, S; Rowan, S; Schiettekatte, F; Shink, R; Torrie, C; Vine, D; Reid, Stuart; Adhikari, R X.

In: Classical and Quantum Gravity, Vol. 35, No. 7, 075001, 23.02.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of elevated substrate temperature deposition on the mechanical losses in tantala thin film coatings

AU - Vajente, G

AU - Birney, Ross

AU - Ananyeva, A

AU - Angelova, S

AU - Asselin, R

AU - Baloukas, B

AU - Bassiri, R

AU - Billingsley, G

AU - Fejer, M M

AU - Gibson, D

AU - Godbout, L J

AU - Gustafson, E

AU - Heptonstall, A

AU - Hough, J

AU - MacFoy, S

AU - Markosyan, A

AU - Martin, I W

AU - Martinu, L

AU - Murray, P G

AU - Penn, S

AU - Roorda, S

AU - Rowan, S

AU - Schiettekatte, F

AU - Shink, R

AU - Torrie, C

AU - Vine, D

AU - Reid, Stuart

AU - Adhikari, R X

PY - 2018/2/23

Y1 - 2018/2/23

N2 - Brownian thermal noise in dielectric multilayer coatings limits the sensitivity of current and future interferometric gravitational wave detectors. In this work we explore the possibility of improving the mechanical losses of tantala, often used as the high refractive index material, by depositing it on a substrate held at elevated temperature. Promising results have been previously obtained with this technique when applied to amorphous silicon. We show that depositing tantala on a hot substrate reduced the mechanical losses of the as-deposited coating, but subsequent thermal treatments had a larger impact, as they reduced the losses to levels previously reported in the literature. We also show that the reduction in mechanical loss correlates with increased medium range order in the atomic structure of the coatings using x-ray diffraction and Raman spectroscopy. Finally, a discussion is included on our results, which shows that the elevated temperature deposition of pure tantala coatings does not appear to reduce mechanical loss in a similar way to that reported in the literature for amorphous silicon; and we suggest possible future research directions.

AB - Brownian thermal noise in dielectric multilayer coatings limits the sensitivity of current and future interferometric gravitational wave detectors. In this work we explore the possibility of improving the mechanical losses of tantala, often used as the high refractive index material, by depositing it on a substrate held at elevated temperature. Promising results have been previously obtained with this technique when applied to amorphous silicon. We show that depositing tantala on a hot substrate reduced the mechanical losses of the as-deposited coating, but subsequent thermal treatments had a larger impact, as they reduced the losses to levels previously reported in the literature. We also show that the reduction in mechanical loss correlates with increased medium range order in the atomic structure of the coatings using x-ray diffraction and Raman spectroscopy. Finally, a discussion is included on our results, which shows that the elevated temperature deposition of pure tantala coatings does not appear to reduce mechanical loss in a similar way to that reported in the literature for amorphous silicon; and we suggest possible future research directions.

U2 - 10.1088/1361-6382/aaad7c

DO - 10.1088/1361-6382/aaad7c

M3 - Article

VL - 35

JO - Classical and Quantum Gravity

JF - Classical and Quantum Gravity

SN - 0264-9381

IS - 7

M1 - 075001

ER -