Limiting Spectral Resolution of a Reflection Grating Made via Electron-beam Lithography

Casey T. DeRoo; Jared Termini; Fabien Grise; Randall L. McEntaffer; Benjamin D. Donovan; Chad Eichfeld

doi:10.3847/1538-4357/abbe15

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Limiting Spectral Resolution of a Reflection Grating Made via Electron-beam Lithography

Journal article

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Limiting Spectral Resolution of a Reflection Grating Made via Electron-beam Lithography

Casey T. DeRoo, Jared Termini, Fabien Grise, Randall L. McEntaffer, Benjamin D. Donovan and Chad Eichfeld

The Astrophysical journal, Vol.904(2), p.142

12/01/2020

DOI: 10.3847/1538-4357/abbe15

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Abstract

Gratings enable dispersive spectroscopy from the X-ray to the optical, and feature prominently in proposed flagships and SmallSats alike. The exacting performance requirements of these future missions necessitate assessing whether the present state-of-the-art in grating manufacture will limit spectrometer performance. In this work, we manufacture a 1.5 mm thick, 1000 nm period (1000 gr mm(-1)) flat grating using electron-beam lithography (EBL), a promising lithographic technique for patterning gratings for future astronomical observatories. We assess the limiting spectral resolution of this grating by interferometrically measuring the diffracted wavefronts produced in first order. Our measurements show this grating has a performance of at least R similar to 14,600, and that our assessment is bounded by the error of our interferometric measurement. The impact of EBL stitching error on grating performance is quantified, and a path to measuring the period error of customized, curved gratings is presented.

Astronomy & Astrophysics

Physical Sciences

Science & Technology

Details

Title: Subtitle: Limiting Spectral Resolution of a Reflection Grating Made via Electron-beam Lithography
Creators: Casey T. DeRoo - University of Iowa
Jared Termini - University of Iowa
Fabien Grise - Pennsylvania State University
Randall L. McEntaffer - Pennsylvania State University
Benjamin D. Donovan - Pennsylvania State University
Chad Eichfeld - Pennsylvania State University
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.904(2), p.142
DOI: 10.3847/1538-4357/abbe15
ISSN: 0004-637X
eISSN: 1538-4357
Publisher: Iop Publishing Ltd
Number of pages: 10
Grant note: ISGC's Undergraduate Research Award 80NSSC19K0661 / NASA; National Aeronautics & Space Administration (NASA) 80NSSC18K1178 / NASA Space Technology Research Fellowship Early Career Investigator Research Program of the Iowa Space Grant Consortium (ISGC)
Language: English
Date published: 12/01/2020
Academic Unit: Physics and Astronomy; University College Courses
Record Identifier: 9984429019002771

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