ABSORBER COATINGS FOR MID-INFRARED ASTROPHYSICS ARD WOLLACK 2 , DA - - PowerPoint PPT Presentation

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Nov 12, 2023 444 likes •573 views

ABSORBER COATINGS FOR MID-INFRARED ASTROPHYSICS ARD WOLLACK 2 , DA DAHLIA BAKER 1 , , EDWAR , KA KARWAN RO ROSTEM 2, 2,3 1. COE COLLEGE, DEPARTMENT OF PHYSICS 2. OBSERVATIONAL COSMOLOGY LAB, NASA GODDARD SPACE FLIGHT CENTER 3. DEPARTMENT

SLIDE 1

ABSORBER COATINGS FOR MID-INFRARED ASTROPHYSICS

DA DAHLIA BAKER1, , EDWAR ARD WOLLACK2 , , KA KARWAN RO ROSTEM2,

2,3

1. COE COLLEGE, DEPARTMENT OF PHYSICS
2. OBSERVATIONAL COSMOLOGY LAB, NASA GODDARD SPACE FLIGHT CENTER
3. DEPARTMENT OF PHYSICS AND ASTRONOMY, THE JOHNS HOPKINS UNIVERSITY

SLIDE 2

Physics and Mathematic Major
Physics Club and Outreach
Studied Computational Biophysics,

moving on to Planetary Science research

ABOUT ME

SLIDE 3

BACKGROUND

HIRMES - High Resolution Mid-InfrarEd Spectrometer
Functioning in the 20-200 micrometer range
Eliminate
SOFIA – Stratospheric Observatory for Infrared Astronomy

SLIDE 4

APPROACH

Goals
Create a material that absorbs stray light
Lightweight, easy applicable
Known dielectric function
What is this?

Describes the electric response to incident radiation

Diffusively reflects rather than specularly reflects
Withstand cryogenic temperatures (µK)
First Step- Characterize the materials
Dielectric functions
Second Step- Matlab Model
Model each sample layer with found dielectric function
Third Step- Manufacturing
Create sample plates

SLIDE 5

APPROACH

3M Glass Microspheres

~100 microns in diameter

Epotech 377H Graphene- Loaded Epoxy

sC(5):377(65):SiOx(30)

Aeroglaze Z306

Specular Diffuse

SLIDE 6

SAMPLES

Sample Letter Thickness

f Epoxy

(µm) Final Layer Count Composition (Layer Order) A 579 2 Epoxy, Z306 B 644 3 Epoxy, Z306, K1 C 449 3 Epoxy, K1, Z306 D 505 4 Epoxy, K1, Z306, K1 E 707 1 Epoxy F 494 2 Epoxy, K1

SLIDE 7

DIELECTRIC CHARACTERIZATION

Frequency (GHz)

22 26 30 34 38 42

Response (dB)

WR28.0 Sampleholder: K1 Microspheres

Average: S11 & S22 Theory: S11, S22 Average: S12 & S21 Theory: S12, S21

Ø Frequency response data taken with a microwave network vector analyzer

Transmission through waveguide Reflection from sample

Periodic structure of reflection shows

constructive and destructive interference

Shows the “true density” as seen by an

incident electromagnetic wave

Loss is due to dielectric properties of

microspheres, scattering due to geometry is not considered

SLIDE 8

THE MODEL

Material Thickness (µm) Dielectric (-) Aluminum 500 1+ 1x108i Epoxy 377H 500 7.4 + 0.4i 3M K1 Microspheres 100 1.1 + 0.002i Aeroglaze Z306 50 2.6 + 0.6i

Response vs. Wavelength

SLIDE 9

RESULTS

Conclusions
Our proposed material can be

manufactured at a small scale

Model predicts correct response
Drawback – model cannot predict

response from diffuse scattering due to microspheres

Further Studies
Measure optical

frequency-dependent response with a Fourier Transform Spectrometer

Transmittance vs. Frequency for Epoxy Reflectance vs. Frequency for Epoxy

SLIDE 10

ACKNOWLEDGEMENTS

Coe College Advisors

Steve Feller Ugur Akgun Firdevs Duru Mario Affatigato

SLIDE 11

ACKNOWLEDGEMENTS

AIP/SPS

SLIDE 12

ACKNOWLEDGEMENTS

NASA and Collaborators

I would like to give special thanks to the Observational Cosmology Lab at NASA Goddard Space Flight Center and my mentors

Edward J. Wollack Karwan Rostem

For their support of my project:

Dave Chuss and Riley McCarten,

Villanova University

Paul Mirel, Observational Cosmology Lab,

NASA GSFC

Kyle Johnson, George Washington University