polarization gratings Frans Snik Mike Escuti + LEOPARD group + - - PowerPoint PPT Presentation

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polarization gratings Frans Snik Mike Escuti + LEOPARD group + - - PowerPoint PPT Presentation

Jan 19, 2023 406 likes •861 views

polarization gratings Frans Snik Mike Escuti + LEOPARD group + GPL group Universiteit Leiden NCSU / ImagineOptix classical phase classical phase classical phase classical phase geometric phase geometric phase geometric phase geometric

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polarization gratings Frans Snik + LEOPARD group Universiteit Leiden Mike Escuti + GPL group NCSU / ImagineOptix

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classical phase

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classical phase

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classical phase

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SLIDE 5

classical phase

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geometric phase

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geometric phase

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geometric phase

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geometric phase

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the polarization grating

courtesy: Michael Escuti (NCSU)

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liq liquid id-cr crystal o

  • ptics

cs

  • 1. any phase pattern thanks to direct-write

technique 2. achromatization thanks to self-aligning multi- twist liquid crystal retarder

Miskiewicz & Escuti (2014) Komanduri et al. (2013)

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diffraction efficiency

Escuti et al. (2016)

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transmission

Packham et al. (2010)

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direct-write resolution + accuracy

Miskiewicz & Escuti (2014) Escuti et al. (2016)

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SLIDE 15

ExPo pIFU

courtesy: Michiel Rodenhuis

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courtesy: Gerard van Harten

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SLIDE 17

courtesy: Gerard van Harten

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SLIDE 18

courtesy: Gerard van Harten

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SLIDE 19

courtesy: Gerard van Harten

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SLIDE 20

courtesy: ImagineOptix

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credit: Studio Roosegaarde, Frans Snik, Michiel Rodenhuis

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WIRC-pol design

45° QWP PG

courtesy: Max Millar-Blanchaer (CalTech)

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SLIDE 24

courtesy: Max Millar-Blanchaer (CalTech)

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courtesy: Max Millar-Blanchaer (CalTech)

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courtesy: Max Millar-Blanchaer (CalTech)

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hyperspectralpolarimetric imaging

courtesy: Jihwan Kim (NCSU)

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LC Bragg gratings

Xiang et al. (2017)

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What if you’re not interested in polarization or m=-1?

Split off half the light effectively with a polarizing beam-splitter + a QWP, and use that light for

  • WFS
  • imaging
  • whatever…
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Apodizing Phase Plate coronagraph

classical phase

  • chromatic
  • impossible to manufacture extreme patterns
  • only 180° instantaneous search space

+p

  • p
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SLIDE 31

+p

  • p

vector-APP coronagraph

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vector-APP coronagraph

geometric phase

  • inherently achromatic
  • use liquid crystals for extreme patterns
  • two complementary PSFs
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th the e vA vAPP PP pr prototype pe

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th the e vA vAPP PP pr prototype pe

Otten, Snik et al. Opt. Express (2014)

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th the e vA vAPP PP pr prototype pe

Otten, Snik et al. Opt. Express (2014)

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th the e vA vAPP PP pr prototype pe

Otten, Snik et al. Opt. Express (2014)

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th the e vA vAPP PP pr prototype pe

Otten, Snik et al. Opt. Express (2014)

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SLIDE 38

th the e vA vAPP PP pr prototype pe

Otten, Snik et al. Opt. Express (2014)

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grating-vAPP (gvAPP)

Otten, Snik et al. SPIE (2014)

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Ma MagAO on

  • n-sk

sky (M (May 6, 2015) ) 3.9 μm μm

Otten, Snik et al. (2017)

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vAPP for LBT courstesy: David Doelman

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  • pol. grating + vAPP
  • pol. grating

48% 48% ~10-4 ~2% ~2%

do doubl uble-gr grating ng-vA vAPP PP

Doelman, Snik, et al. (in prep.)

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