Fig. 2
From: Oral cancer biosensor using ternary photonic crystal and parity time symmetry
Conceptual diagram of a ternary photonic crystal structure \(\:{\left(ABA\right)}^{N}\left(D\right){\left(ABA\right)}^{N}*substrate\) with an embedded biological sample (healthy or cancerous cells) as a defect layer for optical biosensing.
