Amal, here’s an idea for you:
I’m looking at side-emitting glass (not PMMA) fiberoptics for a laser product we’re developing at work, and I found this product from Schott: the IllumaLine sidelight optical fiber.
Here’s my idea:
Ask Schott if the side-emitting glass fiber can be ordered naked, without the plastic sheath, and whether the glass is bio-compatible.
Weld one end of the fiber to the LED end of an xLED casing, and cut the fiber 2 or 3 inches further down, to create a sperm-shaped glass implant with a “tail”.
To implant the thing, puncture the skin with a very long needle, push the xLED in with a regular hollow needle through which the “tail” goes through, but without pushing on the fiber, retract the needle and unthread it from the tail, then work the xLED all the way to the end of the long pocket by gently massaging the skin above until the entire length of the fiber disappears under the skin.
The intended effect of course being a line of light when the xLED is activated, as opposed to a single point of light that’s inconveniently located under the reader’s coil.
The tail could even remain very long, and cut to size by the implantee, according to how far they dare puncture the skin.
The light density along the line might not be enough to show under the skin though. So perhaps a high-power LED version of the xLED (with a zener clamp for good measure) that could be powered by one of those RFID killer devices would compensate.
What do you think? Doable?