Design, fabrication, and testing of stellar coronagraphs for exoplanet imaging

Justin M. Knight, John Brewer, Ryan Hamilton, Karen Ward, Thomas D Milster, Olivier Guyon

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Complex-mask coronagraphs destructively interfere unwanted starlight with itself to enable direct imaging of exoplanets. This is accomplished using a focal plane mask (FPM); a FPM can be a simple occulter mask, or in the case of a complex-mask, is a multi-zoned device designed to phase-shift starlight over multiple wavelengths to create a deep achromatic null in the stellar point spread function. Creating these masks requires microfabrication techniques, yet many such methods remain largely unexplored in this context. We explore methods of fabrication of complex FPMs for a Phased-Induced Amplitude Apodization Complex-Mask Coronagraph (PIAACMC). Previous FPM fabrication efforts for PIAACMC have concentrated on mask manufacturability while modeling science yield, as well as assessing broadband wavelength operation. Moreover current fabrication efforts are concentrated on assessing coronagraph performance given a single approach. We present FPMs fabricated using several process paths, including deep reactive ion etching and focused ion beam etching using a silicon substrate. The characteristic size of the mask features is 5μm with depths ranging over 1μm. The masks are characterized for manufacturing quality using an optical interferometer and a scanning electron microscope. Initial testing is performed at the Subaru Extreme Adaptive Optics testbed, providing a baseline for future experiments to determine and improve coronagraph performance within fabrication tolerances.

Original languageEnglish (US)
Title of host publicationTechniques and Instrumentation for Detection of Exoplanets VIII
PublisherSPIE
Volume10400
ISBN (Electronic)9781510612570
DOIs
StatePublished - Jan 1 2017
EventTechniques and Instrumentation for Detection of Exoplanets VIII 2017 - San Diego, United States
Duration: Aug 8 2017Aug 10 2017

Other

OtherTechniques and Instrumentation for Detection of Exoplanets VIII 2017
CountryUnited States
CitySan Diego
Period8/8/178/10/17

Fingerprint

Coronagraph
Exoplanets
coronagraphs
extrasolar planets
Mask
Masks
Fabrication
masks
Imaging
Imaging techniques
Testing
fabrication
Focal Plane
apodization
Etching
Design
Extreme Adaptive Optics
etching
Wavelength
Microfabrication

Keywords

  • complex FPM
  • exoplanet imaging
  • focal plane mask
  • microfabrication
  • PIAACMC
  • stellar coronagraph

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Knight, J. M., Brewer, J., Hamilton, R., Ward, K., Milster, T. D., & Guyon, O. (2017). Design, fabrication, and testing of stellar coronagraphs for exoplanet imaging. In Techniques and Instrumentation for Detection of Exoplanets VIII (Vol. 10400). [104000N] SPIE. https://doi.org/10.1117/12.2273558

Design, fabrication, and testing of stellar coronagraphs for exoplanet imaging. / Knight, Justin M.; Brewer, John; Hamilton, Ryan; Ward, Karen; Milster, Thomas D; Guyon, Olivier.

Techniques and Instrumentation for Detection of Exoplanets VIII. Vol. 10400 SPIE, 2017. 104000N.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Knight, JM, Brewer, J, Hamilton, R, Ward, K, Milster, TD & Guyon, O 2017, Design, fabrication, and testing of stellar coronagraphs for exoplanet imaging. in Techniques and Instrumentation for Detection of Exoplanets VIII. vol. 10400, 104000N, SPIE, Techniques and Instrumentation for Detection of Exoplanets VIII 2017, San Diego, United States, 8/8/17. https://doi.org/10.1117/12.2273558
Knight JM, Brewer J, Hamilton R, Ward K, Milster TD, Guyon O. Design, fabrication, and testing of stellar coronagraphs for exoplanet imaging. In Techniques and Instrumentation for Detection of Exoplanets VIII. Vol. 10400. SPIE. 2017. 104000N https://doi.org/10.1117/12.2273558
Knight, Justin M. ; Brewer, John ; Hamilton, Ryan ; Ward, Karen ; Milster, Thomas D ; Guyon, Olivier. / Design, fabrication, and testing of stellar coronagraphs for exoplanet imaging. Techniques and Instrumentation for Detection of Exoplanets VIII. Vol. 10400 SPIE, 2017.
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