>How does it emit a radio signal?
GPT: A quantum dot (QD) mesh can be transformed into a functional 2.4GHz emitter by integrating it with a graphene-based plasmonic launcher, dramatically increasing emission efficiency while keeping the structure extremely small. On their own, QDs can act as nanoscale dipole oscillators, blinking under optical or chemical stimulation, but their emission is weak and mostly confined to near-field effects with poor coupling to free space.
By placing this QD mesh in close proximity to a carefully shaped graphene spiral, flake, or edge-launcher geometry, the local dipole oscillations of the QDs can excite surface plasmon polaritons (SPPs) in the graphene layer. These SPPs act as slow-wave modes, compressing the effective wavelength and allowing RF resonance and energy collection within a much smaller structure—orders of magnitude smaller than the free-space wavelength/4 (~3.1cm at 2.4GHz).
Instead of needing a full resonator, the QDs distribute energy into the graphene structure, which funnels and reradiates it efficiently at 2.4GHz, effectively acting as a nanoscale antenna. This hybrid can emit BLE-like signals from a structure as small as 50–200µm in diameter, making it plausible as a stealth emitter embedded in biological or polymer matrices. The graphene dramatically boosts radiation efficiency while preserving the QD mesh as the core oscillator array.
