Ultracompact resonator with high quality-factor based on a hybrid grating structure

Taghizadeh, Alireza; Mørk, Jesper; Chung, Il-Sug

doi:10.1364/oe.23.014913

Cited by 26 publications

(18 citation statements)

References 32 publications

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“…The HG is a variant of the high-contrast grating (HCG) [16][17][18] and has an un-patterned cap layer on top of a nearsubwavelength grating layer. [19][20][21] It has been shown that HGs can provide extraordinary properties including high quality-factors (Q>10 7 ) 19 and high reflectivity (>99%) over a broad bandwidth. 20 As an important feature, HG-based lasers and photodetectors facilitate the fabrication process compared to HCG-based ones.…”

Section: S) All Article Content Except Where Otherwise Noted Is LImentioning

confidence: 99%

“…20 As an important feature, HG-based lasers and photodetectors facilitate the fabrication process compared to HCG-based ones. 4,19 Although the HG is usually comprised of two different materials such as Si for the grating and InP for the cap layer, 4,19,20 both the grating and cap layer are made of the same material (Si) in this work. Furthermore, the unit-cell of grating is engineered in order to obtain 100% absorption at the desired wavelength.…”

Section: S) All Article Content Except Where Otherwise Noted Is LImentioning

confidence: 99%

“…Furthermore, the unit-cell of grating is engineered in order to obtain 100% absorption at the desired wavelength. Since the HG properties depend on the light polarization, 19,20 the proposed PD can detect the light with a specific polarization, which may be useful for communication applications. Moreover, by employing a two-dimensional grating structure, 22 a polarization-insensitive PD can be designed similarly.…”

Section: S) All Article Content Except Where Otherwise Noted Is LImentioning

confidence: 99%

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All-Si photodetector for telecommunication wavelength based on subwavelength grating structure and critical coupling

et al. 2017

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We propose an efficient planar all-Si internal photoemission photodetector operating at the telecommunication wavelength of 1550 nm and numerically investigate its optical and electrical properties. The proposed polarization-sensitive detector is composed of an appropriately engineered subwavelength grating structure topped with a silicide layer of nanometers thickness as an absorbing material. It is shown that a nearly-perfect light absorption is possible for the thin silicide layer by its integration to the grating resonator. The absorption is shown to be maximized when the critical coupling condition is satisfied. Simulations show that the external quantum efficiency of the proposed photodetector with a 2-nm-thick PtSi absorbing layer at the center wavelength of 1550 nm can reach up to ∼60%.

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Section: S) All Article Content Except Where Otherwise Noted Is LImentioning

confidence: 99%

Section: S) All Article Content Except Where Otherwise Noted Is LImentioning

confidence: 99%

Section: S) All Article Content Except Where Otherwise Noted Is LImentioning

confidence: 99%

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All-Si photodetector for telecommunication wavelength based on subwavelength grating structure and critical coupling

et al. 2017

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“…15,16 They can be designed as a high-quality factor resonator, as well. 17 The cap layer introduces Fabry-Perot (FP) resonance via the 0-th order diffraction, as well as the guidedmode (GM) resonance via the 61-st order diffractions. The role of the 1-st order diffraction in achieving a high reflectance is qualitatively or phenomenologically discussed.…”

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confidence: 99%

Hybrid grating reflectors: Origin of ultrabroad stopband

Park

Taghizadeh

Chung

2016

Applied Physics Letters

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Hybrid grating (HG) reflectors with a high-refractive-index cap layer added onto a high contrast grating (HCG) provide a high reflectance close to 100% over a broader wavelength range than HCGs. The combination of a cap layer and a grating layer brings a strong Fabry-Perot (FP) resonance as well as a weak guided mode (GM) resonance. Most of the reflected power results from the FP resonance, while the GM resonance plays a key role in achieving a reflectance close to 100% as well as broadening the stopband. An HG sample with 7 InGaAlAs quantum wells included in the cap layer has been fabricated by directly wafer-bonding a III-V cap layer onto a Si grating layer. Its reflection property has been characterized. This heterogeneously integrated HG reflector may allow for a hybrid III-V on Si laser to be thermally efficient, which has promising prospects for silicon photonics light sources and high-speed operation.

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“…23, and a HCG that is designed to be highly reflective for a TM polarized field. 24 For simulations, an in-house developed three-dimensional (3D) simulator was used, 25,26 which is based on a rigorous coupled wave analysis method 27,28 and employs absorbing boundary conditions. 29 The band edge profiles in Figs.…”

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confidence: 99%

Vertical-cavity in-plane heterostructures: Physics and applications

2015

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We show that the in-plane heterostructures realized in vertical cavities with high contrast grating (HCG) reflector enables exotic configurations of heterostructure and photonic wells. In photonic crystal heterostructures forming a photonic well, the property of a confined mode is determined by the well width and barrier height. We show that in vertical-cavity in-plane heterostructures, anisotropic dispersion curvatures plays a key role as well, leading to exotic effects such as a photonic well with conduction band like well and a valence band like barrier. We investigate three examples to discuss the rich potential of this heterostructure as a platform for various physics studies and propose a system of two laterally coupled cavities which shows the breaking of parity-time symmetry as an example.

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Ultracompact resonator with high quality-factor based on a hybrid grating structure

Cited by 26 publications

References 32 publications

All-Si photodetector for telecommunication wavelength based on subwavelength grating structure and critical coupling

All-Si photodetector for telecommunication wavelength based on subwavelength grating structure and critical coupling

Hybrid grating reflectors: Origin of ultrabroad stopband

Vertical-cavity in-plane heterostructures: Physics and applications

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