Patent Number: 
Section: claims

1. A system for exhibiting Cherenkov radiation comprising: a beam of traveling charged particles; and  a photonic crystal structure that receives said beam of charged particles, said charged particles move in said photonic crystal structure so that Cherenkov radiation is produced at all velocities without requiring resonances in the effective material constants of said photonic crystal structure. 2. The system of  claim 1 , wherein said beam of charged particles comprise of an electron beam. claim 1 3. The system of  claim 2 , wherein said photonic crystal structure comprises of output waveguides where said Cherenkov radiation outputs said photonic crystal structure. claim 2 4. The system of  claim 3 , wherein said Cherenkov radiation is received by one or more photomultipliers. claim 3 5. The system of  claim 4 , wherein said dispersion of charges particles are absorbed by an absorber. claim 4 6. The system of  claim 3 , wherein said electron beam is formed by a cathode-anode arrangement. claim 3 7. The system of  claim 6 , wherein said Cherenkov radiation is tunable by frequency. claim 6 8. The system of  claim 7 , wherein said frequency is tunable by scaling the photonic crystal structure. claim 7 9. The system of  claim 2 , wherein said photonic crystal structure comprises of no output waveguides. claim 2 10. The system of  claim 2 , wherein said beam of traveling charged particles travels in an all-air channel of said photonic crystal structure. claim 2 11. A method of exhibiting Cherenkov radiation comprising: providing a beam of charged particles; and  providing a photonic crystal structure that receives said beam of charged particles, said charged particles moving in said photonic crystal structure so that Cherenkov radiation is produced at all velocities without requiring resonances in the effective material constants of said photonic crystal structure. 12. The method of  claim 11 , wherein said charged particles comprise of an electron beam. claim 11 13. The method of  claim 12 , wherein said photonic crystal structure comprises of output waveguides where said Cherenkov radiation outputs said photonic crystal structure. claim 12 14. The method of  claim 13 , wherein said Cherenkov radiation is received by one or more photomultipliers. claim 13 15. The method of  claim 14 , wherein said dispersion of charges particles are absorbed by an absorber. claim 14 16. The method of  claim 13 , wherein said electron beam is formed by a cathode-anode arrangement. claim 13 17. The method of  claim 16 , wherein said Cherenkov radiation is tunable by frequency. claim 16 18. The method of  claim 17 , wherein said frequency is tunable by scaling the photonic crystal structure. claim 17 19. The method of  claim 12 , wherein said beam of traveling charged particles travels in an all-air channel of said photonic crystal structure. claim 12 20. The method of  claim 12 , wherein said photonic crystal structure comprises no output waveguides. claim 12