Design of a terahertz photonic crystal transmission filter containing ferroelectric material

Abstract

The ferroelectric material KTaO₃ (KTO) has a very high refractive index, which is advantageous to the photonic crystal (PC) design. KTO polycrystalline crystal has a high extinction coefficient. In this work, we perform a theoretical study of the transmission properties of a PC bandpass filter made of polycrystalline KTO at terahertz (THz) frequencies. Our results show that the defect modes of usual PC narrowband filters no longer exist because of the existence of the high loss. We provide a new PC structure for the high-extinction materials and show that it has defect modes in its transmittance spectra, providing a possible bandpass filter design in the THz region.

Multichannel filtering properties of one-dimensional graphene photonic crystals with high refractive index media layer

“…We have noticed that in recent years, some researchers have proposed to construct photonic crystals using dielectric materials with high refractive index to realize channel filtering [14][15][16][17][18]. High refractive index medium plays a crucial role in some modern optical devices [19].…”

“…Using this ferroelectric composite material, King et al constructed a new periodic multilayer structure to achieve multichannel filtering [15]. King et al also studied the narrow band filtering characteristics of Cantor quasi-periodic photonic crystal constructed with ferroelectric material KTaO 3 [16]. Hsu et al studied the narrow band filtering characteristics of a finite photonic crystal containing nearly ferroelectric superconductor [17].…”

Modulation of terahertz properties of 3D ceramic photonic crystals via post‐creation non‐metal anion doping treatment

“…Thus, THz functional devices could be designed and created based on the special optical properties of terahertz photonic crystals (TPCs). Taking advantage of the bandgap and defect modes of TPCs, various THz optical devices had been created, including waveguides, filters, switches, and modulators …”

Calculation of the thickness and optical constants of lead titanate thin films grown on MgO from their transmission spectra

“…As a result, technological and economic constraints have arisen which has pusched manufacturers to miniaturize the devices more and more and the research has developed on integrated ferro and piezoelectric materials of increasingly reduced size, mainly in thin films form. Materials based on Pb such as PbTiO3 are the best piezoelectric and ferroelectric materials families suitable for devices integration such as non-volatile memories [1], Infra-red sensors [2,3], dielectric properties [4] and terahertz transmission filter [5]. PbTiO 3 (PT) is one of the more interesting and more studied peroveskites possessing a ferroelectric phase under ambient conditions [6].…”