• Black Zone Plate physics hoodie, pixel-art Fresnel zone plate design, worn by a model, front close-up
  • Black Zone Plate physics hoodie, pixel-art Fresnel zone plate design, worn by a model, back close-up
  • Black Zone Plate physics hoodie, pixel-art Fresnel zone plate design, front view
  • Black Zone Plate physics hoodie, pixel-art Fresnel zone plate design, back view
  • Black Zone Plate physics hoodie, pixel-art Fresnel zone plate design, turning on a model
  • Black Zone Plate physics hoodie, ΨP Pixelated Physics neck label
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Zone Plate HoodieFOCUS BY SUBTRACTION | Pixelated PhysicsHoodie

Zone Plate Hoodie – FOCUS BY SUBTRACTION | Pixelated Physics

$54.99 USD
$54.99 USD
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Shipping calculated at checkout. Free US shipping · $10 flat shipping outside the US.
Color
Black
Size
S–5XL
Made
To order · shipping times

Can rings replace a lens? A Fresnel zone plate can. Each ring, or zone, sits half a wavelength farther from the focus than the last, so neighbouring zones cancel. Block every other zone and the light that is left arrives in step. With four open zones the focus is about 64 times brighter than without the plate. Black pixel-art hoodie; equation, symbols and sources in the physics panel below.

Color
Size

Size guideS–5XL · inches

Free US shipping$10 flat shipping outside the USMade to order, ships in 2–5 business days

Details

Size & fitS–5XL

Unisex Heavy Blend hoodie (Gildan 18500), classic fit.

SizeWidthLengthSleeve
S202733.5
M222834.5
L242935.5
XL263036.5
2XL283137.5
3XL303238.5
4XL323339.5
5XL343440.5

Measurements in inches. Width and length ±1 in, sleeve (from center back) ±0.75 in.

ShippingFree US

Free US shipping. $10 flat shipping outside the US.

Delivery times & where we ship

Returns & replacements21 days

Every item is printed to order, so we can’t accept returns or exchanges for change of mind, or if you ordered the wrong size or colour.

Print defect, misprint, damage or the wrong item? We’ll send a free replacement, or a refund if you prefer. Report it within 21 days of delivery with a photo; no need to send it back.

Full refund & replacement policy

The physics

A zone plate focuses light with no glass at all. It is a set of rings, alternately clear and opaque.

The rings are Fresnel zones: each one sits half a wavelength farther from the focus than the last, so r_n² = nλf + n²λ²/4.

Light from neighbouring zones arrives out of step and cancels. Block every other zone and what is left arrives in step, so it adds up at the focus.

On the hoodie the filled rings are the blocked odd zones (the centre disc is zone 1) and the black gaps are the open even zones.

With 8 zones and the odd ones blocked, the on-axis intensity at f is about 64 times that of the unobstructed wave. We checked that by summing the zones numerically.

Equations

\[r_n^2 = n\lambda f + \tfrac{n^2\lambda^2}{4}\]
\[\sqrt{f^2+r_n^2}-f = \tfrac{n\lambda}{2}\]
SymbolMeaningUnit
\(r_n\) outer radius of the n-th zone \(\mathrm{m}\)
\(n\) zone number (1, 2, 3, …) —
\(\lambda\) wavelength of the light \(\mathrm{m}\)
\(f\) primary focal length \(\mathrm{m}\)

Sources

  1. Hecht, E., Optics, 5th ed., Sec. 10.3 (Fresnel diffraction, the zone plate)
  2. Born & Wolf, Principles of Optics, Ch. 8 (Fresnel zones)
  3. Wikipedia, Zone plate
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