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Trapping light inside a crystal.
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โ€ข Footage courtesy: Questionable Chemistry (@QuestionableChemistry) โ€” https://www.youtube.com/watch?v=QcCrRDYiejg
โ€ข Footage courtesy: NileRed โ€” https://www.youtube.com/watch?v=grpSfjUImUs

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Transcript
00:00Oxide layers on bismuth crystals form microscopic cavities that trap specific light wavelengths.
00:06Stepped metallic terraces manipulate photon trajectories by inducing quantum interference
00:12within submicron cavities. Light enters the microscopic stepped funnels, undergoing repeated
00:20total internal reflection and resonant scattering without escape. Ultra-thin oxide layers on the
00:26stepped surfaces cause thin-film interference, creating vibrant colors and intricate optical
00:32effects. These microscopic cavities strongly confine electromagnetic radiation, significantly
00:39altering local optical density of states. Photons are trapped within the microscopic oxide layer,
00:46where multiple reflections between stepped crystal terraces create localized optical resonance.
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