Interplay of Purcell Effect, Stimulated Emission, and Leaky Modes in the Photoluminescence Spectra of Microsphere Cavities

Chien, Ching-Hang; Wu, Shang-Hsuan; Ngo, Trong Huynh-Buu; Chang, Yia-Chung

doi:10.1103/physrevapplied.11.051001

Cited by 11 publications

(2 citation statements)

References 35 publications

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“…Its optical feedback direction can also be consistent with the device's light output direction, which helps to enhance the interaction between the light field and the excitons in the light‐emitting layer, thus improving light output efficiency. More importantly, the Purcell effect in a microcavity can also effectively control the radiative transition of the gain material, which can lower the lasing threshold [53, 54] . Therefore, we used a planar microcavity structure as the resonator.…”

Section: Resultsmentioning

confidence: 99%

Solid‐State Red Laser with a Single Longitudinal Mode from Carbon Dots

et al. 2021

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Miniaturized solid‐state lasers with a single longitudinal mode are vital for various photonic applications. Here we prepare red‐emissive carbon dots (CDs) with a photoluminescence quantum yield (PLQY) of 65.5 % by combining graphitic nitrogen doping and surface modification. High‐concentration doping alters the CDs’ emission from blue to red, while the electron‐donating groups and polymer coating on their surfaces improve the PLQY and photostability. The CDs exhibit excellent stimulated emission characteristics, with a low threshold of amplified spontaneous emission (ASE) and long gain lifetime. A planar microcavity with only one resonant mode, which fitted with the CDs’ ASE peak, was constructed. Combining the CDs and microcavity produced a solid‐state laser with a single longitudinal mode, a linewidth of 0.14 nm and a signal‐to‐noise ratio of 14.8 dB (Q∼4600). Our results will aid the development of colorful solid‐state micro/nano lasers with potential use in practical photonics.

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Section: Resultsmentioning

confidence: 99%

Solid‐State Red Laser with a Single Longitudinal Mode from Carbon Dots

et al. 2021

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“…This idea is of great interest, and the phenomenon of changing the environment of the atom to regulate the spontaneous emission rate of the atom is called the Purcell effect. Purcell effect widely exists in metamaterials [3,4], acoustic systems [5] and various systems [6][7][8][9][10][11][12][13][14] and is the beginning of cavity quantum electrodynamics (CQED), which will be described below.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Neutron Lifetime and Purcell Effect

He,

Zhu

2021

Preprint

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Purcell effect predicts that spontaneous radiation is not an intrinsic property of matter, but is affected by the environment in which it is located, and is the result of the interaction of matter and field. Purcell effect can be inferred from Fermi's Gold rule through strict quantum electrodynamics (QED), and through it can achieve the enhancement or suppression of radiation. We suggest that, in principle, the Purcell effect can be detected at the percentage level of neutron decay in experiments with trapped ultra-cold neutrons. As a test of our claim, we propose a currently achievable experimental protocol that can detect whether Purcell effect has occurred in an trapped ultra-cold neutron lifetime measurement experiment. Finally, we discuss the discrepancy in current methods of measuring neutron lifetime, which may be caused by different experimental setups.

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Microresonators in Lithium Niobate Thin Films

Xie

Chen

et al. 2021

Advanced Optical Materials

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geometries of microcavities supporting "whispering gallery modes" (WGMs) the light field can be confined in extremely small volumes, reaching very high power density and very narrow spectral linewidth. As a result, the ultrahigh in-cavity intensities significantly enhance the photon-tophoton interactions, leading to ultrahigh efficiencies of nonlinear optical process even at low-power optical excitation. In addition, the small scale enables the construction of resonator-based functional devices with very high integration. With combination of these intriguing features, low-power-consumption, low-cost on-chip devices can be developed successfully. The material platforms for microresonators are crucial for the practical applications. For example, silicon dioxide (SiO 2 ) is considered as one of the most commonly used materials for microresonators, and great success has been achieved based on this easy-to-fabricate platform. [29,30] Recently, with the well-developed technology for on-chip circuits fabrication, some semiconductor materials have been harnessed as the platforms of microresonators for more electro-optic potentials, such as silicon (Si), [31,32] SiC, [33][34][35][36] ZnO, [37,38] GaN, [39,40] or AlN [41,42] . Among them, lithium niobate (LiNbO 3 or LN) has risen into the forefront of microresonator demonstrations and drawn extensive interests in photonics and electronics.Lithium niobate is a multi-functional dielectric crystal that combines a number of excellent features, [43] such as electrooptic, nonlinear optical, acousto-optic, ferroelectric, piezoelectric, photorefractive, photo-luminescent properties, and receives a broad variety of applications in telecommunication, frequency conversion, optical storage, filtering, and quantum photonics. [44][45][46][47] The single-crystal thin film of LN is an ideal platform for microresonators owing to the unique combination of various excellent properties of the bulk. The major obstacle of the LN-based microcavities was the fabrication of high-quality LN thin films because the single-crystalline features cannot be well-preserved in thin-film LN produced by chemical methods of normal deposition that is applied for semiconductors. In addition, large-scale LN-thin film wafers are desired for further processing of on-chip devices. Recently, the so-called "lithium niobate on insulator" (LNOI) technology figures the major problem out and boosts the rapid development of the thin-film LN based devices. [48][49][50][51][52][53] Most used LN films are manufactured by smart " Ion cut" technique. The typical commercialized LN thin film based on ion cut consists of a single-crystalline LN thin film with thickness of 300-900 nm, a cladding layer of SiO 2 with thickness of 2-3 µm, and the supporting material (LN or Si bulk wafer). The fabrication process of ion-cut LN thin film can be referenced in details elsewhere. [54][55][56] The refractive Leveraging the outstanding nonlinear optical properties and the ultra-high spatial confinement of light, microresonators based on lith...

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Interplay of Purcell Effect, Stimulated Emission, and Leaky Modes in the Photoluminescence Spectra of Microsphere Cavities

Cited by 11 publications

References 35 publications

Solid‐State Red Laser with a Single Longitudinal Mode from Carbon Dots

Solid‐State Red Laser with a Single Longitudinal Mode from Carbon Dots

Measurement of Neutron Lifetime and Purcell Effect

Microresonators in Lithium Niobate Thin Films

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