Can a hologram be programmed to emit a specific frequency of EM radiation? Do holograms emit EM radiation, or is it possible to program a hologram to emit specific frequencies of EM? If possible, would it require light shining on the hologram to emit the EM?
I am asking this question to verify the science behind the "Food Freshness Card". From their website:

The Food Freshness Card is a large hologram that is programmed with
longitudinal electromagnetic waves. Our U.S. patented process allows
us to modulate these longitudinal electromagnetic waves with different
frequencies or frequency spectra. The modulations to these waves
target specific strains of bacteria and mold which can inhibit their
growth. The Food Freshness Card does not directly kill mold or
bacteria but instead creates an environment that can slow their growth
rate. Mold and bacteria are main causes of food spoilage, if you can
inhibit the rate at which they grow, you can increase the shelf life
of food.
https://foodfreshnesscard.com/

I know there have been studies demonstrating EM radiation inhibiting bacterial growth, but I'm curious if this is actually possible with a hologram.
 A: Holograms are just interference patterns, they can not produce any wavelengths they are not illuminated with. Further, the claim of it being "programmed with longitudinal electromagnetic waves" is pure technobabble. Longitudinal electromagnetic waves do not exist outside of certain physical systems.
A: From the patent:


*

*A food freshness card, comprising: a card substrate; and a chip body attached to the card substrate, the chip body including a
material programmed via longitudinal carrier waves to emit energetic
information tuned for interaction with an organic structure in a piece
of food or liquid when the chip body is positioned proximate the piece
of food. (emphasis mine)

*The food freshness card of claim 1, wherein the chip body is positioned on an exterior surface of the card substrate for direct contact with the piece of food.

*The food freshness card of claim 1, wherein the programmed material has an effective strength of emission of approximately 5 feet in radius for indirect contact with the piece of food.


And then

The ability to carry information through longitudinal wave carriers has until now, been underutilized. FIG. 1 shows an example of a Tesla coil, waveform/signal generator connected to a spherical electrode as disclosed by Konstantin Meyl's book Scalar Wave Technology: Documentation for the Experimental-Kit for the Transmission of Electrical Scalar Waves. Configured correctly, the Tesla coil may produce a longitudinal wave which may carry energetic information over space. (emphasis mine)

So, its not the holograms that emit EM radiation, but instead the Tesla coil inside the built-in chip.

