Integrated Optics Using High Contrast Gratings

Chang-Hasnain, Connie J.; Yang, Wankou

doi:10.1002/9781119011781.ch2

Cited by 4 publications

(1 citation statement)

References 106 publications

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“…The design parameters for the structure include the indices of refraction of the high and low index materials, grating period, thickness, and duty cycle [25,[58][59][60]. When the period of the grating becomes smaller than the incident wavelength, which is known as a subwavelength grating, only the zeroth diffraction order exists in the reflected and transmitted waves and all the higher diffraction orders are evanescent modes [58].…”

Section: Wide Stop Band Of Dbrmentioning

confidence: 99%

Recent Approaches for Broadening the Spectral Bandwidth in Resonant Cavity Optoelectronic Devices

Park

et al. 2015

Advances in Condensed Matter Physics

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Resonant cavity optoelectronic devices, such as vertical cavity surface emitting lasers (VCSELs), resonant cavity enhanced photodetectors (RCEPDs), and electroabsorption modulators (EAMs), show improved performance over their predecessors by placing the active device structure inside a resonant cavity. The effect of the optical cavity, which allows wavelength selectivity and enhancement of the optical field due to resonance, allows the devices to be made thinner and therefore faster, while simultaneously increasing the quantum efficiency at the resonant wavelengths. However, the narrow spectral bandwidth significantly reduces operating tolerances, which leads to severe problems in applications such as optical communication, imaging, and biosensing. Recently, in order to overcome such drawbacks and/or to accomplish multiple functionalities, several approaches for broadening the spectral bandwidth in resonant cavity optoelectronic devices have been extensively studied. This paper reviews the recent progress in techniques for wide spectral bandwidth that include a coupled microcavity, asymmetric tandem quantum wells, and high index contrast distributed Bragg-reflectors. This review will describe design guidelines for specific devices together with experimental considerations in practical applications.

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Section: Wide Stop Band Of Dbrmentioning

confidence: 99%

Recent Approaches for Broadening the Spectral Bandwidth in Resonant Cavity Optoelectronic Devices

Park

et al. 2015

Advances in Condensed Matter Physics

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Mechanism and sensitivity of Fano resonance tuning in high-contrast gratings

Yao

Her

2021

Conference on Lasers and Electro-Optics

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Thin-film dielectric characterization by bound state in the continuum in high contrast grating

Lin,

Chang,

Her

et al. 2024

Opt. Express

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Subwavelength high contrast grating (HCG) is renowned for its remarkable ability to produce sharp optical resonance, known as the bound state in the continuum (BIC). Due to the strong surface field enhancement, the resonant wavelength and quality factor (Q factor) are highly sensitive to the dielectric properties of the surrounding medium. We propose utilizing this extraordinary phenomenon for thin-film dielectric characterization based on a film-substrate-grating configuration. By optimizing the geometrical parameters to control the cross-interference between guided modes in the grating and self-interference of propagating wave in the substrate slab, an accidental BIC with a Q factor reaching 104 is excited. Using this BIC, two retrieval methods based on contour mapping of resonant wavelength and Q factor are proposed to extract the complex permittivity (εf) of the film under test. It has been demonstrated that with a film thickness as thin as 10−5 times the grating period, the error in the retrieved Re[εf] is below 2%, and that of Im[εf] is below 10%. The proposed design is a strong candidate for non-destructive dielectric characterization of thin films with thicknesses below one-thousandth of the operating wavelength. This characterization technique can facilitate the development of high-frequency devices for the 6 G high-speed communication.

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Integrated Optics Using High Contrast Gratings

Cited by 4 publications

References 106 publications

Recent Approaches for Broadening the Spectral Bandwidth in Resonant Cavity Optoelectronic Devices

Recent Approaches for Broadening the Spectral Bandwidth in Resonant Cavity Optoelectronic Devices

Mechanism and sensitivity of Fano resonance tuning in high-contrast gratings

Thin-film dielectric characterization by bound state in the continuum in high contrast grating

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