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Analysis of Wire Grid Polarizer Test Configurations and Results for LED Arrays

A study by Jinseok Ko and Steve Scott for DNB Meeting June 6, 2005 explores wire grid polarizer test setups comparing unpolarized LED arrays with various reference transmission axes. Results suggest systematic errors and configuration differences influencing polarization angle variations. Data serves as a future testing reference with different configurations and incline variations. Investigation includes analyses with a dichroic polarization sheet.

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Analysis of Wire Grid Polarizer Test Configurations and Results for LED Arrays

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  1. Wire grid polarizer test : (1) reference results Jinseok Ko and Steve Scott DNB Meeting June 6, 2005

  2. motivation MSE angle (deg) Major R (cm) LED array along DNB line

  3. “uwg” test setup wire side glass side (unpolarized) collimated LED detector rotational polarizer wire grid polarizer

  4. “ugw” test setup wire side glass side (unpolarized) collimated LED detector rotational polarizer wire grid polarizer

  5. with various reference transmission axes (“rta”) 90 180 0 For various reference transmission axis between 0 to 180 (0, 1, 5, 10, … , 89, 90, 91, … 170, 180)

  6. analytic predictions giving different aoi air “aw” air coating air glass “acw” “agw” air coating glass air glass coating “acgw” “agcw”

  7. “ugw” test setup wire side glass side (unpolarized) collimated LED detector rotational polarizer wire grid polarizer

  8. observations • Measurement shows • (1) parabolic behavior consistent with the prediction • (2) linear behavior (presumably) due to systematic errors • “uwg” configuration results more match “acgw” (or “agw”) predictions • “ugw” configuration results more match “aw” prediction • (which is confusing… : need to check the surface again) • “ugw” configuration shows larger polarization angle variations, that is, linear • components than “uwg”, implying a difference in the systematic error between • two configurations • This data set will serve as a reference for future tests future tests • “u” + blank glass + “wg” • “u” + blank glass + “gw” • “uwg”, “ugw”, “ubwg”, “ubgw” with tilting angle variations • Same tests with a dichroic (plastic) polarization sheet

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