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We propose to achieve a strong bistable response of a thin layer of a saturable absorption medium by involving a planar metamaterial specially designed to bear a high-Q trapped-mode resonance in the infrared region.

thirty seconds (determined by the setting of VRJ, which allows condenser C2 to charge up to its full high voltage, V2 ikes and relay RLB operates:(i) opening RLB, and releasing relay RLA;(ii) closing RLB,. 3. Closure of RLB, applies a negative pulse to the control grid of the cold cathode tetrode V,, as a result of which the anode to cathode path immediately becomes conducting, and condenser C8 discharges through the primary of the ignition coil TR4. This produces in the secondary a damped oscillatory transient with an initial highly positive peak which, applied to the trigger electrode, flashes the discharge tube.4. Release of relay R L A restores the negative bias to V, $0 that the ax. energized relay RLB is released, and, after a short interval for recharging C8, the circuit conditions prior to operation of SW3 are resumed.A two-minute thermal delay switch S W, prevents application of anode voltage to the gas triode V2 until its heater has warmed up.

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