14. Applications to Device Physics—Photon Band Gap of Holographic Photonic Quasicrystals

This chapter delves into the applications of device physics, specifically focusing on the photon band gap of holographic photonic quasicrystals (PQCs). It begins by highlighting the superiority of soft-matter quasicrystals over solid quasicrystals in terms of photonic band gap (PBG) properties. The construction of two-dimensional PQCs with different rotational symmetries using multi-beam holographic interference is discussed, followed by an investigation of their PBG properties using the finite element method (FEM). The results demonstrate that 10-fold and 12-fold PQCs are more effective in forming PBGs. The chapter also includes practical fabrication methods, such as single-prism holographic lithography, to create 10-fold PQCs. Additionally, the chapter introduces the concept of cholesteric liquid crystals (CLCs) and their unique optical properties, providing a broader context for understanding photonic structures. This chapter is essential for researchers and engineers aiming to design and fabricate advanced photonic integrated devices.