Sorry, no online dictionaries contain the exact phrase photon barrier.
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Reverse dictionary results:
1. mass
 2. quantum
3. transition
4. barred
5. bars
6. curtain
7. hurdle
8. shade
9. var
10. -escent
 11. achromatic
12. admit
13. airglow
14. airily
15. allnight
16. aperture
17. arc
18. armet
19. aureole
20. aurora
 21. batfowl
22. black
23. blind
24. blinds
25. blip
26. block out
27. breeze block
28. brush
29. caf
30. casquet
 31. casquetel
32. cast
33. casted
34. catch
35. cathode-ray tube
36. cellulose
37. chaff
38. chaffing
39. chat
40. chromatic

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