Broadband antireflection enhancement by triangular grating microstructure in the resonance domain

Chen, Lianna; Jing, Xufeng; Wang, Le; Zhang, Junchao; Jin, Shangzhong; Tian, Ying

doi:10.1016/j.optlastec.2013.12.026

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…Therefore, in the future, we should discuss potential ways for improving grating efficiency with following strategies: the first potential way is that we could design an encapsulated five-port polarization-independent grating, because such grating structure can reduce the Fresnel reflection and improve the transmission efficiencies for both TE and TM polarizations [31]. The second potential way is that we could design a triangular-groove five-port polarization-independent grating, because such special triangular-groove five-port transmission grating configuration can effectively decrease interfacial reflection on surface of the grating [32].…”

Section: Study Of Fabrication Tolerance and Incident Spectral Bandwidthmentioning

confidence: 99%

Polarization-Independent Two-Layer Grating With Five-Port Splitting Output Under Normal Incidence

Gong

Wen

2020

IEEE Photonics J.

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In this paper, we report a two-layer five-port diffraction grating by a polarizationindependent design under normal incidence. To be different from conventional five-port gratings, initially, we design a novel two-layer grating with operation in transmission. Next, we firstly design a polarization-independent grating with five-port splitting output. On the one hand, the accurate grating vector parameters are optimized using rigorous coupled-wave analysis (RCWA) approach. On the other hand, the inherent coupling mechanism happened in the grating region can be well explained by employing simplified modal method (SMM). More importantly, all reported conventional five-port beam splitter gratings were designed based on polarization dependent. Although they could obtain high diffraction efficiency for TE or TM polarization, it requires more complicated and time-consuming fabrication processes in practical grating applications. Thus, this work can open up a possible thought for designing polarization-independent multi-port beam splitter diffraction gratings.

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Section: Study Of Fabrication Tolerance and Incident Spectral Bandwidthmentioning

confidence: 99%

Polarization-Independent Two-Layer Grating With Five-Port Splitting Output Under Normal Incidence

Gong

Wen

2020

IEEE Photonics J.

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“…In recent years, a new approach for antireflection has been proposed and widely adopted [29][30][31][32][33][34][35][36][37][38]. In this approach, one places arrays of nanoparticles at or near the air-dielectric interface ( Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Sufficient condition for perfect antireflection by optical resonance at dielectric interface

Wang

Sandhu

et al. 2015

SPIE Proceedings

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Reflection occurs at an air-material interface. The development of antireflection schemes, which aims to cancel such reflection, is important for a wide variety of applications including solar cells and photodetectors. Recently, it has been demonstrated that a periodic array of resonant subwavelength objects placed at an air-material interface can significantly reduce reflection that otherwise would have occurred at such an interface. Here, we introduce the theoretical condition for complete reflection cancellation in this resonant antireflection scheme. Using both general theoretical arguments and analytical temporal coupled-mode theory formalisms, we show that in order to achieve perfect resonant antireflection, the periodicity of the array needs to be smaller than the free-space wavelength of the incident light for normal incidence, and also the resonances in the subwavelength objects need to radiate into air and the dielectric material in a balanced fashion. Our theory is validated using first-principles full-field electromagnetic simulations of structures operating in the infrared wavelength ranges. For solar cell or photodetector applications, resonant antireflection has the potential of providing a low-cost technique for antireflection that does not require nanofabrication into the absorber materials, which may introduce detrimental effects such as additional surface recombination. Our work here provides theoretical guidance for the practical design of such resonant antireflection schemes.

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“…In recent years, a new approach for antireflection has been proposed and widely adopted [24][25][26][27][28][29][30][31][32][33]. In this approach, one places arrays of nanoparticles at or near the air-dielectric interface ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Condition for perfect antireflection by optical resonance at material interface

Wang¹,

Yu²,

Sandhu³

et al. 2014

Optica

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Reflection occurs at an air-material interface. The development of antireflection schemes, which aims to cancel such reflection, is important for a wide variety of applications including solar cells and photodetectors. Recently, it has been demonstrated that a periodic array of resonant subwavelength objects placed at an air-material interface can significantly reduce reflection that otherwise would have occurred at such an interface. Here, we introduce the theoretical condition for complete reflection cancellation in this resonant antireflection scheme. Using both general theoretical arguments and analytical temporal coupled-mode theory formalisms, we show that in order to achieve perfect resonant antireflection, the periodicity of the array needs to be smaller than the free-space wavelength of the incident light for normal incidence, and also the resonances in the subwavelength objects need to radiate into air and the dielectric material in a balanced fashion. Our theory is validated using first-principles full-field electromagnetic simulations of structures operating in the infrared wavelength ranges. For solar cell or photodetector applications, resonant antireflection has the potential for providing a low-cost technique for antireflection that does not require nanofabrication into the absorber materials, which may introduce detrimental effects such as additional surface recombination. Our work here provides theoretical guidance for the practical design of such resonant antireflection schemes.

show abstract

Broadband antireflection enhancement by triangular grating microstructure in the resonance domain

Cited by 4 publications

References 24 publications

Polarization-Independent Two-Layer Grating With Five-Port Splitting Output Under Normal Incidence

Polarization-Independent Two-Layer Grating With Five-Port Splitting Output Under Normal Incidence

Sufficient condition for perfect antireflection by optical resonance at dielectric interface

Condition for perfect antireflection by optical resonance at material interface

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