Polymer-based MHCG as selective mirror

Jandura, Daniel; Czyszanowski, Tomasz; Pudiš, Dušan; Marciniak, Magdalena; Goraus, Matej; Urbancová, Petra

doi:10.1016/j.apsusc.2020.146827

Cited by 4 publications

(4 citation statements)

References 23 publications

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“…We consider two orthogonal polarizations: transverse-electric (TE), for which electric field of electromagnetic wave is parallel to the stripes, and transverse-magnetic (TM), where the magnetic component of the electromagnetic field is parallel to the grating stripes. We have validated the accuracy of the method in numerous analyses ,, by comparison with experimental reflection spectra of MHCGs and with simulated transmission spectra from other numerical models, showing very good agreement. These previous studies support the results and conclusions presented here.…”

Section: Influence Of Cross-sectional Shape On the Maximal Power Refl...mentioning

confidence: 71%

Impact of Stripe Shape on the Reflectivity of Monolithic High Contrast Gratings

Marciniak

Chang

et al. 2021

ACS Photonics

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Monolithic high contrast gratings (MHCGs) composed of a one-dimensional grating patterned in a monolithic layer provide up to 100% optical power reflectance and can be fabricated in almost any semiconductor and dielectric material used in modern optoelectronics. MHCGs enable monolithic integration, polarization selectivity, and versatile phase tuning. They can be from 10 to 20 times thinner than distributed Bragg reflectors. The subwavelength dimensions of MHCGs significantly reduce the possibility of ensuring the smoothness of the sidewalls of the MHCG stripes and make precise control of the shape of the MHCG stripe cross-section difficult during the etching process. The question is then whether it is more beneficial to improve the etching methods to obtain a perfect cross-section shape, as assumed by the design, or whether it is possible to find geometrical parameters that enable high optical power reflectance using the shape that a given etching method provides. Here, we present a numerical study supported by the experimental characterization of MHCGs fabricated in various materials using a variety of common surface nanometer-scale shaping methods. We demonstrate that MHCG stripes with an arbitrary cross-section shape can provide optical power reflectance of nearly 100%, which greatly relaxes their fabrication requirements. Moreover, we show that optical power reflectance exceeding 99% with a record spectral bandwidth of more than 20% can be achieved for quasi-trapezoidal cross-sections of MHCGs. We also show that sidewall corrugations of the MHCG stripes have only a slight impact on MHCG optical power reflectance if the amplitude of the corrugation is less than 16% of the MHCG period. This level of stripe fabrication precision can be achieved using the most current surface etching methods. Our results are significant for the design and production of a variety of photonic devices employing MHCGs. The flexibility with regard to crosssection shape facilitates the reliable fabrication of highly reflective subwavelength grating mirrors. This in turn will enable the manufacture of monolithically integrated high-quality-factor optical micro-and nanocavity devices.

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Section: Influence Of Cross-sectional Shape On the Maximal Power Refl...mentioning

confidence: 71%

Impact of Stripe Shape on the Reflectivity of Monolithic High Contrast Gratings

Marciniak

Chang

et al. 2021

ACS Photonics

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“…This can be seen in the measured NSOM image in Figure 4d. The maximum power reflectance of prepared MHCG with the real cross-section of the stripes can be observed at the wavelength 780 nm [5]. Therefore, we decided to investigate the optical field also in a subwavelength regime (L<λ).…”

Section: Resultsmentioning

confidence: 99%

“…Special subwavelength single-layer grating deposited on a layer with a refractive index equal to the refractive index of the grating is called monolithic high-contrast grating (MHCG). In [5] we demonstrated that MHCG prepared in polymer material with a refractive index lower than 1.75 could achieve high enough power reflectance for the applications in resonant cavity enhanced photodetectors and light emitting diodes. Due to the periodic modulation of grating stripes, diffraction orders at the far field and self-images at the near field can be observed, which is called the Talbot effect [6].…”

Section: Introductionmentioning

confidence: 98%

Talbot self-imaging effect on the MHCG characterized by NSOM

Jandura

Pudiš²,

Czyszanowski³

2022

22nd Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics

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In this paper, the design and preparation of polymer based monolithic high-contrast grating (MHCG) structures and their Talbot self-imaging effect are presented. For the preparation of MHCG structures to IP-Dip negative photoresist material, 3D laser lithography was used. The shape and morphological properties of the prepared MHCG structure were investigated by scanning electron microscope (SEM). Finally, the highly resolved near-field scanning optical microscope (NSOM) for the vertical optical field distribution over the grating structure was used. The demonstration of the Talbot effect for different wavelengths in a diffraction and a subwavelength regime is presented theoretically and experimentally from NSOM measurements.

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“…In the analysis, we use 60 plane waves that enable numerical relative error below 10 −8 . The model has been shown to have high reliability by comparison with experimental results [41,42]. In the analysis we consider transverse electric (TE) polarization, where the electric field is parallel to the grating stripes.…”

Section: Methodsmentioning

confidence: 99%

Concept of Inverted Refractive-Index-Contrast Grating Mirror and Exemplary Fabrication by 3D Microprinting

Pruszyńska-Karbownik¹,

Jandura²,

Dems³

et al. 2023

Preprint

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Highly reflective mirrors are indispensable components in a variety of state-of-the-art photonic devices. Typically used, bulky, multi-layered distributed Bragg (DBR) reflectors are limited to latticematched semiconductors or nonconductive dielectrics. Here, we introduce an inverted refractiveindex-contrast grating (ICG), as compact, single layer alternative to DBR. In the ICG, a subwavelength one-dimensional grating made of a low refractive index material is implemented on a high refractive index cladding. Our numerical simulations show that the ICG provides nearly total optical power reflectance for the light incident from the side of the cladding whenever the refractive index of the grating exceeds 1.75, irrespective of the refractive index of the cladding. Additionally, the ICG enables polarization discrimination and phase tuning of the reflected and transmitted light, the property not achievable with the DBR. We experimentally demonstrate a proof-of-concept ICG fabricated according to the proposed design, using the technique of 3D microprinting in which thin stripes of IP-Dip photoresist are deposited on a Si cladding. This one-step method avoids laborious and often destructive etching-based procedures for grating structuration, making it possible to implement the grating on any arbitrary cladding material.

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Polymer-based MHCG as selective mirror

Cited by 4 publications

References 23 publications

Impact of Stripe Shape on the Reflectivity of Monolithic High Contrast Gratings

Impact of Stripe Shape on the Reflectivity of Monolithic High Contrast Gratings

Talbot self-imaging effect on the MHCG characterized by NSOM

Concept of Inverted Refractive-Index-Contrast Grating Mirror and Exemplary Fabrication by 3D Microprinting

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