Calculation and fabrication of two-dimensional complete photonic bandgap structures composed of rutile TiO2 single crystals in air/liquid

Matsushita, Sachiko; Matsutani, Akihiro; Morii, Yasushi; Kobayashi, D.; Nishioka, Kunio; Dake, S.; Sato, Muneharu; Tatsuma, Tetsu; Sannomiya, Takumi; Isobe, Toshihiro; Nakajima, Akira

doi:10.1007/s10853-015-9436-8

Cited by 6 publications

(3 citation statements)

References 38 publications

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Section: Introductionmentioning

confidence: 99%

“…Many efforts have been made in the past few years to obtain a CPBG at lower RICs [13][14][15]. By rotation angle, a hexagonal air hole structure based on rutile TiO 2 with a refractive index of 2.85 has been proposed and a CPBG of 1.5% has been obtained [14]. Moreover, chalcogenide photonic crystal (PC) slow light waveguides with RICs of 2.85 and 2.6 have been reported respectively [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Complete photonic bandgap in silicon nitride slab assisted by effective index difference between polarizations

Hou

Yang

et al. 2022

Front. Optoelectron.

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The slab effective index difference between the transverse-electric (TE) and transverse-magnetic (TM) polarizations was utilized to obtain complete photonic bandgap (CPBG) in a silicon nitride (SixNy) photonic crystal slab. For this, coincident frequency range in the TE photonic bandgap (PBG) and TM PBG, which denotes the CPBGs of the slab, must be found with the same structure. Through adjusting the effective index pair of TE and TM polarizations by changing the thickness of the SixNy core layer, and also optimizing the structure parameters within the photonic crystal plane, a large normalized CPBG of 5.62% was theoretically obtained in a slab of SixNy with a refractive index of 2.5. Moreover, based on the obtained CPBG, a microcavity which could support both TE and TM polarization was theoretically demonstrated. The cavity modes for different polarizations were both well confined, which proved the reliability of the CPBG. In addition, using the same method, the lowest refractive index of SixNy on silica slab for a CPBG could be extended to as low as 2. The results indicate that there is potential for development of various high-performance CPBG devices based on SixNy slab technology. Graphical Abstract

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Complete photonic bandgap in silicon nitride slab assisted by effective index difference between polarizations

Hou

Yang

et al. 2022

Front. Optoelectron.

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“…Basically, the topological pattern of constituent materials contributes to the special properties of PhCs. One of the most important and fundamental properties of PhCs is the possible existence of photonic band gaps (PBGs), within which the propagation of electromagnetic waves is prohibited [1,2]. The broader band gap means more practical applications, so it is desirable for PhCs with large band gaps.…”

Section: Introductionmentioning

confidence: 99%

Designing photonic materials with complete band gaps by topology optimization

Chen

Meng

et al. 2018

Smart Mater. Struct.

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Photonic materials may exhibit the band gap, within which the propagation of electromagnetic waves is totally prohibited. To achieve a complete photonic band gap (CPBG) for transverse magnetic (TM) and transverse electric (TE) modes, the bi-directional evolutionary structure optimization (BESO) method originated from structural design is extended for this purpose. The optimization problem is formulated with maximizing the minimum imaginary part of complex wave vectors for TM and TE modes. According to sensitivity analysis, the material distribution within the primitive unit cell of photonic materials is adjusted step by step so as to enlarge the minimum imaginary part of wave vectors. In doing so, the CPBG at the specific frequency is obtained at the desired frequency, and the optimized structures of photonic materials with novel topological patterns are achieved. Numerical examples demonstrate that the effectiveness of the proposed topology optimization method for opening the CPBGs at various specified frequencies, which is of significance in controlling the propagation of electromagnetic waves of any polarization.

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The preparation and study of multilayer structured SiO2–TiO2 film: the effects of photonic crystals on enhanced photocatalytic properties

Liu

Yuan

et al. 2020

J Mater Sci

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Calculation and fabrication of two-dimensional complete photonic bandgap structures composed of rutile TiO2 single crystals in air/liquid

Cited by 6 publications

References 38 publications

Complete photonic bandgap in silicon nitride slab assisted by effective index difference between polarizations

Complete photonic bandgap in silicon nitride slab assisted by effective index difference between polarizations

Designing photonic materials with complete band gaps by topology optimization

The preparation and study of multilayer structured SiO2–TiO2 film: the effects of photonic crystals on enhanced photocatalytic properties

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