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The periodic morphology of a structurally chiral material (SCM) can be chirped periodically in order to display a multitude of photonic stopbands similar to the circular Bragg phenomenon display by a regular SCM. Chirp can be continuous or disruptive in phase; when chirp is phase-disruptive, more and tighter photonic stopbands occur in the defect mode.
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Fei Wang (2018) studied this question.
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