"...a GRadient INdex lens made of gelatin. The rough recipe for the lens which is demonstrated is: Mix 2 packets of Knox gelatin with 1/3 cup of cold water. Make a saturated sugar solution with 1/2 cup of boiling water. Mix the hot water with the gelatin, pour into mold and let set in the refrigerator for ~1 hour. Place lens in water bath for 8-12 hours so the sugar can leach out creating a radially changing index of refraction."
03 November 2010
Fiber Optic Jello ~ Cooking Up GRIN Lens @ MIT
Prof Raskar's student Andrew Bardagjy demos a Jello GRIN Lens...