Photonic Band-gap Material segmentation by type distinguishes structural dimensionality and material composition, each influencing manufacturing cost and performance envelope. One‑dimensional (1‑D) multilayer stacks, comprising alternating high‑ and low‑index layers, dominate the low‑cost segment and contribute roughly 30 % of total volume, primarily serving filter and reflector functions. Two‑dimensional (2‑D) photonic crystals, characterized by periodicity in a plane, account for about 25 % and are favored in integrated photonic circuits where in‑plane confinement is critical. Three‑dimensional (3‑D) crystals, offering full‑band gaps, represent 20 % of the market despite higher fabrication complexity, targeting high‑performance sensing and quantum‑optics platforms. Material‑based subcategories further refine the taxonomy: Silicon‑based structures, prevalent in CMOS‑compatible processes, hold 35 % of the type share; Polymer‑based photonic crystals, valued for flexibility and rapid prototyping, capture 30 %; and III‑V semiconductor variants, delivering active gain media, comprise the remaining 35 % across dimensionalities. This type‑centric market taxonomy underscores how structural and compositional choices dictate cost structures and application suitability within the Photonic Band‑gap Material market.