High index top layer for multimaterial coatings

Steinlechner, J.; Martin, I. W.

doi:10.1103/physrevd.93.102001

Cited by 4 publications

(1 citation statement)

References 22 publications

(27 reference statements)

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“…This idea can be extended to using even more than three materials [50] or to concentrating on improving the top layer of the coating [53].…”

Section: (D) Multi-materials Coatingsmentioning

confidence: 99%

Development of mirror coatings for gravitational-wave detectors

Steinlechner

2018

Phil. Trans. R. Soc. A.

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Gravitational waves are detected by measuring length changes between mirrors in the arms of kilometre-long Michelson interferometers. Brownian thermal noise arising from thermal vibrations of the mirrors can limit the sensitivity to distance changes between the mirrors, and, therefore, the ability to measure gravitational-wave signals. Thermal noise arising from the highly reflective mirror coatings will limit the sensitivity both of current detectors (when they reach design performance) and of planned future detectors. Therefore, the development of coatings with low thermal noise, which at the same time meet strict optical requirements, is of great importance. This article gives an overview of the current status of coatings and of the different approaches for coating improvement.This article is part of a discussion meeting issue 'The promises of gravitational-wave astronomy'.

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“…This idea can be extended to using even more than three materials [50] or to concentrating on improving the top layer of the coating [53].…”

Section: (D) Multi-materials Coatingsmentioning

confidence: 99%

Development of mirror coatings for gravitational-wave detectors

Steinlechner

2018

Phil. Trans. R. Soc. A.

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Neutron Star Extreme Matter Observatory: A kilohertz-band gravitational-wave detector in the global network

Ackley

Adya

Agrawal

et al. 2020

Publ. Astron. Soc. Aust.

173

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Gravitational waves from coalescing neutron stars encode information about nuclear matter at extreme densities, inaccessible by laboratory experiments. The late inspiral is influenced by the presence of tides, which depend on the neutron star equation of state. Neutron star mergers are expected to often produce rapidly rotating remnant neutron stars that emit gravitational waves. These will provide clues to the extremely hot post-merger environment. This signature of nuclear matter in gravitational waves contains most information in the 2–4 kHz frequency band, which is outside of the most sensitive band of current detectors. We present the design concept and science case for a Neutron Star Extreme Matter Observatory (NEMO): a gravitational-wave interferometer optimised to study nuclear physics with merging neutron stars. The concept uses high-circulating laser power, quantum squeezing, and a detector topology specifically designed to achieve the high-frequency sensitivity necessary to probe nuclear matter using gravitational waves. Above 1 kHz, the proposed strain sensitivity is comparable to full third-generation detectors at a fraction of the cost. Such sensitivity changes expected event rates for detection of post-merger remnants from approximately one per few decades with two A+ detectors to a few per year and potentially allow for the first gravitational-wave observations of supernovae, isolated neutron stars, and other exotica.

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Silicon nitride and silica quarter-wave stacks for low-thermal-noise mirror coatings

et al. 2018

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This study investigated a multi-layer high reflector with new coating materials for nextgeneration laser interferometer gravitational wave detectors operated at cryogenic temperatures. We used the plasma-enhanced chemical vapor deposition method to deposit amorphous silicon nitride/silica quarter-wave high-reflector stacks and studied the properties pertinent to the coating thermal noise. Room-and cryogenic-temperature mechanical loss angles of the silicon nitride/silica quarter-wave bilayers were measured using the cantilever ring-down method. We showed, for the first time, that the bulk and shear loss angles of the coatings can be obtained from the cantilever ring-down measurement, and used the bulk and shear losses to calculate the coating thermal noise of silicon nitride/silica high-reflector coatings. The mechanical loss angle of the silicon nitride/silica bilayer is dispersive with a linear weakly positive frequency dependence, and hence, the coating thermal noise of the high reflectors showed a weakly positive frequency dependence in addition to the normal 1 / f dependence. The coating thermal noise of the silicon nitride/silica high-reflector stack is compared to the lower limit of the coating thermal noise of the end test mirrors of ET-LF, KAGRA, LIGO Voyager, and the directly measured coating thermal noise of the current coatings of Advanced LIGO. The optical absorption of the silicon nitride/silica high reflector at 1550 nm is 45.9 ppm. Using a multimaterial system composed of seven pairs of ion-beam-sputter deposited

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High index top layer for multimaterial coatings

Cited by 4 publications

References 22 publications

Development of mirror coatings for gravitational-wave detectors

Development of mirror coatings for gravitational-wave detectors

Neutron Star Extreme Matter Observatory: A kilohertz-band gravitational-wave detector in the global network

Silicon nitride and silica quarter-wave stacks for low-thermal-noise mirror coatings

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