Light absorption in hybrid silicon-on-insulator/quantum dot waveguides

Omari, Abdoulghafar; Geiregat, Pieter; Thourhout, Dries Van; Hens, Zeger

doi:10.1364/oe.21.023272

Cited by 7 publications

(7 citation statements)

References 30 publications

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“…The linear optical properties of hybrid QD-functionalized have been investigated by Omari et al [48], [58] Here, nearinfrared PbS/CdS QDs [59] were deposited on top of siliconon-insulator ridge and rib waveguides (see Fig. 8) using Langmuir-Blodgett deposition cycles (see III.A).…”

Section: A Non-embedded Qds and Modal Lossmentioning

confidence: 99%

Colloidal Quantum Dots Enabling Coherent Light Sources for Integrated Silicon-Nitride Photonics

Wang

Zhu

Bisschop

et al. 2017

IEEE J. Select. Topics Quantum Electron.

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Integrated photonic circuits, increasingly based on silicon (-nitride), are at the core of the next generation of low-cost, energy efficient optical devices ranging from on-chip interconnects to biosensors. One of the main bottlenecks in developing such components is that of implementing sufficient functionalities on the often passive backbone, such as light emission and amplification. A possible route is that of hybridization where a new material is combined with the existing framework to provide a desired functionality. Here, we present a detailed design flow for the hybridization of silicon nitride-based integrated photonic circuits with so-called colloidal quantum dots (QDs). QDs are nanometer sized pieces of semiconductor crystals obtained in a colloidal dispersion which are able to absorb, emit and amplify light in a wide spectral region. Moreover, they combine costeffective solution based deposition methods, ambient stability and low fabrication cost. Starting from the linear and non-linear material properties obtained on the starting colloidal dispersions, we can predict and evaluate thin film and-device performance, which we demonstrate through characterization of the first onchip QD based laser.

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Section: A Non-embedded Qds and Modal Lossmentioning

confidence: 99%

Colloidal Quantum Dots Enabling Coherent Light Sources for Integrated Silicon-Nitride Photonics

Wang

Zhu

Bisschop

et al. 2017

IEEE J. Select. Topics Quantum Electron.

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“…It is important to note that, as the emission wavelength of chemically synthesized quantum dots can be precisely controlled, the working bandwidth of quantum dot based optoelectronic chips can be easily tuned to other wavelength regions within the transparency region of the Si waveguides. optical lithography and Langmuir-Blodgett deposition [44]. The results of this investigation are presented in Figures 4(c) and 4(d).…”

Section: Iii/v Colloidal Quantum Dotsmentioning

confidence: 88%

Hybrid Materials for Integrated Photonics

Bettotti

2014

Advances in Optics

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In this review materials and technologies of the hybrid approach to integrated photonics (IP) are addressed. IP is nowadays a mature technology and is the most promising candidate to overcome the main limitations that electronics is facing due to the extreme level of integration it has achieved. IP will be based on silicon photonics in order to exploit the CMOS compatibility and the large infrastructures already available for the fabrication of devices. But silicon has severe limits especially concerning the development of active photonics: its low efficiency in photons emission and the limited capability to be used as modulator require finding suitable materials able to fulfill these fundamental tasks. Furthermore there is the need to define standardized processes to render these materials compatible with the CMOS process and to fully exploit their capabilities. This review describes the most promising materials and technological approaches that are either currently implemented or may be used in the coming future to develop next generations of hybrid IP devices.

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“…The sub-wavelength thickness ensures a good coupling to the optical mode. 39 The emission of the QDs upon excitation to the continuum states by means of a helium-neon laser and an estimated absorption spectrum based on the amplitude of the pump-probe curves are shown in Fig. 1(c).…”

Section: Samplesmentioning

confidence: 99%

Sideband pump-probe technique resolves nonlinear modulation response of PbS/CdS quantum dots on a silicon nitride waveguide

et al. 2017

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For possible applications of colloidal nanocrystals in optoelectronics and nanophotonics, it is of high interest to study their response at low excitation intensity with high repetition rates, as switching energies in the pJ/bit to sub-pJ/bit range are targeted. We develop a sensitive pump-probe method to study the carrier dynamics in colloidal PbS/CdS quantum dots deposited on a silicon nitride waveguide after excitation by laser pulses with an average energy of few pJ/pulse. We combine an amplitude modulation of the pump pulse with phase-sensitive heterodyne detection. This approach permits to use co-linearly propagating co-polarized pulses. The method allows resolving transmission changes of the order of 10−5 and phase changes of arcseconds. We find a modulation on a sub-nanosecond time scale caused by Auger processes and biexciton decay in the quantum dots. With ground state lifetimes exceeding 1 μs, these processes become important for possible realizations of opto-electronic switching and modulation based on colloidal quantum dots emitting in the telecommunication wavelength regime.

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Light absorption in hybrid silicon-on-insulator/quantum dot waveguides

Cited by 7 publications

References 30 publications

Colloidal Quantum Dots Enabling Coherent Light Sources for Integrated Silicon-Nitride Photonics

Colloidal Quantum Dots Enabling Coherent Light Sources for Integrated Silicon-Nitride Photonics

Hybrid Materials for Integrated Photonics

Sideband pump-probe technique resolves nonlinear modulation response of PbS/CdS quantum dots on a silicon nitride waveguide

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