Angular-dependent polarization-insensitive filter fashioned with zero-contrast grating

Gao, Xumin; Wu, Tong; Xu, Yin; Li, Xin; Bai, Dan; Zhu, Gangyi; Zhu, Hongbo; Wang, Yongjin

doi:10.1364/oe.23.015235

Cited by 21 publications

(17 citation statements)

References 27 publications

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“…Moreover, dielectric gratings have become attractive planar components for optical engineering, owing to their scale-invariant operation in the visible, near-infrared, mid-infrared, and terahertz spectral regions. Recently a novel subwavelength structure, the high contrast grating (HCG), has been attracting attention9101112. Owing to its remarkable performance in terms of dispersion, reflectivity, and bandwidth13, HCGs are widely used in quantum cavities1415, vertical-cavity surface-emitting lasers (VCSELs)16, polariton lasers17, and optomechanical nanoresonators18, replacing the conventional distributed Bragg reflector.…”

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confidence: 99%

Normal incidence filters using symmetry-protected modes in dielectric subwavelength gratings

Xuan

Tian

et al. 2016

Sci Rep

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We investigate narrowband transmission filters based on subwavelength-grating reflectors at normal incidence. Computational results show that the filtering is realized through symmetry-protected mode coupling. The guided mode resonances introduced by the slab layer allow flexible control of the filter frequencies. The quality factor of the filters could exceed 106. Dielectric gratings can be used over the entire range of electromagnetic waves, owing to their scale-invariant operations. Owing to the high refraction index and low index dispersion of semiconductors in the infrared range, these filters can be applied over a broad range from near infrared to terahertz frequencies.

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Normal incidence filters using symmetry-protected modes in dielectric subwavelength gratings

Xuan

Tian

et al. 2016

Sci Rep

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“…As an excellent optical material, HfO 2 is transparent from the visible to infrared range [17,18] and often acts as a high refractive index material or the waveguide layer in optical devices [19]. The structure of suspended HfO 2 ZCG filters has been demonstrated in the visible wavelength range [20][21][22]. Fig.…”

Section: Zcg Hfo 2 Filtermentioning

confidence: 99%

Free-space-to-waveguide demultiplexer featuring zero-contrast gratings

Gao

Bai

et al. 2017

Optics Communications

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We present here a method to achieve an optical demultiplexer working in the visible range to achieve either a polarization beamsplitter (PBS) or the wavelength-division multiplexer (WDM), which is based on the integration of different periodic gratings using the suspended zero contrast grating (ZCG) structure. The proposed demultiplexer comprises two independent ZCG HfO 2 filters, which are very close to each other so that they can be illuminated and measured at the same time. By combining two independent HfO 2 ZCG filters with selectable functionalities in parallel and extending the waveguides on both sides, a PBS device or WDM device can be achieved. The finite difference time-domain (FDTD) method is used to simulate the coupling properties of the ZCG filters. The simulation results show that the proposed PBS device can effectively direct different polarized light with a wavelength of 650 nm into separate waveguides. The WDM device can also separate incoming 550 nm and 650 nm light beams into separate waveguides. The fabricated devices are characterized by the optical microscope and the atomic force microscope (AFM).

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“…The high index contrast is important to allow for good performance of HCGs [22]. There have been designs [23,24] in which a thin layer of substrate is the same material as the grating that is used to support the HCG. It is however still difficult to make HCGs which are suspended in vacuum for large-scale applications compared to polymer-based materials.…”

Section: Introductionmentioning

confidence: 99%

Experiment and Simulation of a Selective Subwavelength Filter with a Low Index Contrast

Asbahii

Lim

et al. 2019

Nanomaterials

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Subwavelength gratings have been of great interest recently due to their ability to eliminate multiple orders. However, high index contrast (Δn∼3) is typically achieved using metals or high-index dielectrics surrounded by vacuum in order to maintain good optical selectivity. Here, we theoretically propose and experimentally realize a selective subwavelength grating using an index contrast of Δn∼1.2 without vacuum. Despite its low index contrast, our simulation and experiments show that good optical selectivity is achieved using the same physics as subwavelength gratings made of high-index contrast. Such polymer-based encapsulated gratings are easier to scale up for use in large-area applications such as photovoltaics and lighting.

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Angular-dependent polarization-insensitive filter fashioned with zero-contrast grating

Cited by 21 publications

References 27 publications

Normal incidence filters using symmetry-protected modes in dielectric subwavelength gratings

Normal incidence filters using symmetry-protected modes in dielectric subwavelength gratings

Free-space-to-waveguide demultiplexer featuring zero-contrast gratings

Experiment and Simulation of a Selective Subwavelength Filter with a Low Index Contrast

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