Miniature viscometer incorporating GaN optical devices with an ultrawide measurement range

Luo, Yumeng; Lu, Gaofei; Wang, Qi; Chu, Zhiqin; Li, Kwai Hei

doi:10.37188/lam.2023.002

Cited by 3 publications

(1 citation statement)

References 37 publications

(24 reference statements)

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“…Quantum well (QW) diodes that inherently exhibit multifunctionalities of light emission, detection, modulation, and energy harvesting have great potential for the development of monolithic optoelectronic systems. − In particular, their emission spectra partially overlap with their responsivity spectra due to the same QW active region, and thus, the QW diode is able to detect, modulate, and harvest the light emitted by itself. , By using the same fabrication process flow, we can monolithically integrate different QW diodes into a single chip, − in which all these components share identical QW structures. Zhang et al demonstrated a monolithic GaN optoelectronic system consisting of a transmitter, a waveguide, a beam splitter, receivers, and a monitor, in which light emission, propagation, and detection can be manipulated, and data communication among them is realized through photons.…”

Section: Introductionmentioning

confidence: 99%

Unification of Irreversibility and Energy Diagram Theory

Liu

et al. 2023

ACS Omega

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A simultaneous emission-detection phenomenon occurs when a quantum well (QW) diode is biased with a forward voltage and illuminated with a shorterwavelength light beam. The diode is able to detect and modulate light emitted by itself due to its spectral emission-detection overlap. Here, two identical QW diode units separately function as a transmitter and a receiver to establish a wireless light communication system. In association with energy diagram theory, we explain the irreversibility between light emission and light excitation in the QW diode, which may help us deeply understand various expressions in nature.

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Section: Introductionmentioning

confidence: 99%

Unification of Irreversibility and Energy Diagram Theory

Liu

et al. 2023

ACS Omega

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Vertically stacked quantum well diodes for multifunctional applications

Fu,

Wang

et al. 2023

Opt. Lett.

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Dual-functioning multiple quantum well (MQW) diodes can simultaneously transmit and receive information through visible light. Here, we report vertically stacked red, green, and blue (RGB) MQW diodes for light detection and display applications. Both blue and green MQW diodes are monolithically integrated with distributed Bragg reflector (DBR) filters to realize the separation of light. The versatile RGB MQW transmitter/receiver system not only creates full-color display but also effectively separates RGB light into various colors. These results open feasible routes to generate multifunctional device for the development of full-color display and light receiver.

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GaN integrated optical devices for glycerol viscosity measurement

Luo,

Yu,

et al. 2024

Opt. Lett.

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This Letter presents the fabrication and characterization of a chip-scale GaN optical device for measuring glycerol viscosity. The monolithically integrated GaN chip with a size of 1 × 1 mm2 comprises a light-emitting diode (LED) and a photodiode (PD) on a transparent sapphire substrate. The glycerol droplet applied to the device acts as a medium for coupling light from the LED to the PD. When a mechanical impulse is applied, the droplet undergoes a damped vibration that depends on its viscosity, causing a change in its shape and altering the path of light propagation. The viscosity of the glycerol sample can be determined by obtaining the rate of attenuation of the measured photocurrent signals. The proposed unit offers a fast time response in microseconds and requires only a small sample volume of 5 µl. The developed device is highly suitable for the practical measurement of glycerol viscosity due to its miniaturization, low cost, and ease of operation without the need for external optical components.

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Miniature viscometer incorporating GaN optical devices with an ultrawide measurement range

Cited by 3 publications

References 37 publications

Unification of Irreversibility and Energy Diagram Theory

Unification of Irreversibility and Energy Diagram Theory

Vertically stacked quantum well diodes for multifunctional applications

GaN integrated optical devices for glycerol viscosity measurement

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