More details would probably be helpful.
Ok, so, details.
Both of the proposed new technologies (I'll leave "exotic sh*t" as a thought for the moment, and leave it up to you completely on how to use it, if in any way) rely on the TIR and are offshoots of that technology. Specifically, they rely on the "perfect
one-way mirror" aspect of the technology, where electromagnetic radiation can pass into, but not out of the TIR-encircled area (excepting the very narrow escape cone).
1) Thermal annihilator (link to
calcs, link to
scaling). The proposed device works like this: One creates an
ellipsoidal area of space, encased in a TIR field. Around it one places radiators that would radiate heat in the form of electromagnetic radiation into the encased area (to increase effectiveness, one might make a tiered confocal system of ellipsoids, where the radiators are in the outer area, from which light can pass into the inner one, but not vice-versa) . Within the ellipsoidal area, in the two focuses of the ellipsoid, one places two special devices, from here on dubbed "heat sinks". This can be done via magnetic fields or mass effect.
These heat sinks are spherical, with a thin outer layer made out of a material with high melting point and low greyness (i.e. one that is close to a black body at high temperatures). The insides of the heat sinks are thermally insulated (by vacuum and ceramics) form the outer layer. They contain temperature monitoring equipment and a TIR generator with an appropriate power source (probably an arc reactor). Heat sinks periodically switch between emitter and receiver modes (one is in the emitter mode when the other is in the receiver mode). In the receiver mode, the TIR generators are switched off, and the outer layer gets heated up by the electromagnetic radiation bouncing off the ellipsoidal TIR walls and the other sphere. In the emitter mode, TIR generators of the heat sink are switched on. This prevents it from receiving virtually any heat, while not preventing it from emitting it, causing it to rapidly cool down.
As per my
other calculations pertaining to black body radiation and mass effect, total power emitted by a body in the mass lowering field from the perspective of the observer outside said field is smaller than it would have been without the field despite the blueshift. This means that the total energy of such a system will get smaller and smaller over time. For other calculations and explanations, please see the links in the beginning of this description.
2) Laser capacitors. Again, this is based on the fact that TIR provides us a one-way perfect mirror. By creating a specific TIR geometry and firing a laser into it at a specific angle, it might be possible to accumulate laser beam in the TIR-enclosed area, essentially turning it into
gain medium of sorts, although it would act quite differently than a normal one. This gain medium (or even an actual gain medium, where resonator cavity was made out of TIR fields or at least supplemented with them) would have an almost unlimited (up to pair production, and probably also limited by the fact that no vacuum is perfect and such things) capacity for energy storage. A laser beam from a steady-state laser would accumulate in it (also note that, as the laser would come from an area with higher C, it would be blueshifted, further increasing its power, likely by orders of magnitude). After some time (i.e. when enough energy is accumulated in the trap), the trap can be opened (via altering the geometry and/or properties of the border TIR fields) to release the laser impulse in a single burst.
One possible (at the first and very tired glance) geometry for such a thing would be a toroidal volume where light would come in tangentially.
2b) Weird things. I am pretty sure that at some point electromagnetic field of sufficient intensity would start affecting space in interesting ways, such as promoting pair production from vacuum and locally bending space near the beam. This could probably be exploited for fun and profit.