Emerging opportunities for ultra-high Q whispering gallery mode microcavities

Song, Qinghai

doi:10.1007/s11433-018-9349-2

Cited by 59 publications

(22 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After that, efficient microresonator OFC generation is realized using on-chip platforms [1] and fiber-coupled WGM resonators with ultrahigh-Q factors [7][8][9][10][11]. Silica possesses the advantage of low optical absorption and thus it is an ideal candidate for fabricating the ultrahigh-Q WGM resonator, which presents an excellent performance for OFC generation [6,[12][13][14][15][16][17][18][19][20]. Especially, the zero dispersion wavelength of the silica microsphere resonator can be easily designed by controlling its diameter (D), and it is thus an alternative platform for generating the ultralow-threshold OFCs [16,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Controllable Kerr and Raman-Kerr frequency combs in functionalized microsphere resonators

et al. 2019

View full text Add to dashboard Cite

Optical frequency comb (OFC) based on the whispering-gallery-mode microresonator has various potential applications in fundamental and applied areas. Once the solid microresonator is fabricated, its structure parameters are generally unchanged. Therefore, realizing the tunability of the microresonator OFC is an important precondition for many applications. In this work, we proposed and demonstrated the tunable Kerr and Raman-Kerr frequency combs using the ultrahigh-quality-factor (Q) functionalized silica microsphere resonators, which are coated with iron oxide nanoparticles on their end surfaces. The functionalized microsphere resonator possesses Q factors over 108 and large all-optical tunability due to the excellent photothermal performance of the iron oxide nanoparticles. We realized a Kerr frequency comb with an ultralow threshold of 0.42 mW and a comb line tuning range of 0.8 nm by feeding the control light into the hybrid microsphere resonator through its fiber stem. Furthermore, in order to broaden the comb span, we realized a Raman-Kerr frequency comb with a span of about 164 nm. Meanwhile, we also obtained a comb line tuning range of 2.67 nm for the Raman-Kerr frequency comb. This work could find potential applications in wavelength-division multiplexed coherent communications and optical frequency synthesis.

show abstract

Section: Introductionmentioning

confidence: 99%

Controllable Kerr and Raman-Kerr frequency combs in functionalized microsphere resonators

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The above developments in the synthesized micro‐ and nanolasers have also boosted the progresses of corresponding practical applications. The semiconductor nanowires have been integrated as light sources and nonlinear devices into on‐chip photonic circuits . By monitoring the spectrum, nanowire lasers can also be utilized as optical sensors and optical routers .…”

Section: Introductionmentioning

confidence: 99%

Single‐Crystalline Perovskite Microlasers for High‐Contrast and Sub‐Diffraction Imaging

Wang

Xiao

et al. 2019

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

Bottom-up synthesized single-crystalline micro-and nanolasers have been intensively studied in past decades. While the potential of single-crystalline lasers in integrated photonics has been seriously considered for years, their device performances are restricted by the scattering loss. Here, in contrast to the utilization of Q-factor or laser linewidth, the ultrasmooth surfaces of lead halide perovskite microplate lasers are exploited and their potential in subdiffraction limit imaging is explored for the first time. The nanostructures on the surface of the microplate can effectively scatter the evanescent waves and make the corresponding subwavelength spatial information detectable at far field. With the assistance of perovskite microlasers, a 41 nm nanogap and complex nanostructures are resolved with a conventional microscope. Meanwhile, more than 1000 determinants within the lasing are imaged simultaneously and the image contrast is further improved by the amplification of perovskite microlasers. This work shall revolutionize the applications of single-crystalline microlasers and subdiffraction limit imaging techniques.

show abstract

“…More importantly, the multiple scatterers result in the symmetric backscattering in a single microdisk [26,27]. The symmetric backscattering forbids any degeneracy with only trivial eigenstates, thus the coherent interface between electrons and photons at DPs is hard to achieve.Single microdisks have two-dimensional Hamiltonians based on the clockwise (CW) and counterclockwise (CCW) modes [28]. The symmetric backscattering results in the splitting between eigenstates, corresponding to the absolute value of backscattering coupling strength.Previous works on active microdisks mainly focused on the splitting in the spectrum, and further investigations are limited by the low controllability [29][30][31].…”

mentioning

confidence: 99%

“…Single microdisks have two-dimensional Hamiltonians based on the clockwise (CW) and counterclockwise (CCW) modes [28]. The symmetric backscattering results in the splitting between eigenstates, corresponding to the absolute value of backscattering coupling strength.…”

mentioning

confidence: 99%

Diabolical points in coupled active cavities with quantum emitters

et al. 2020

View full text Add to dashboard Cite

In single microdisks, embedded active emitters intrinsically affect the cavity mode of microdisks, which results in a trivial symmetric backscattering and a low controllability. Here we propose a macroscopical control of the backscattering direction by optimizing the cavity size. The signature of positive and negative backscattering directions in each single microdisk is confirmed with two strongly coupled microdisks. Furthermore, the diabolical points are achieved at the resonance of two microdisks, which agrees well with the theoretical calculations considering backscattering directions. The diabolical points in active optical structures pave a way to implement quantum information processing with geometric phase in quantum photonic networks.Diabolical points (DPs) and exceptional points (EPs) describe degeneracies of systems depending on parameters [1,2]. EPs refer to degeneracies of non-Hermitian system with coalescent eigenstates, which is quite popular in the system with gain and loss such as PT-symmetry systems [3][4][5]. DPs means the degeneracy of Hermitian system with twofold orthognal eigenstates. Compared to EPs with gain and loss, DPs have more practical feasibility, provide the geometric phase with controlled phase shift and also introduce new approaches to studying topological or quantum DP behaviors [6][7][8][9][10][11]. Thus, photons in photonic structures at DPs have potential applications in the quantum information and quantum computation [12][13][14][15]. Meanwhile, active emitters in photonic structures are essential for the coherent electron-photon interface to implement quantum information processing in the quantum photonic network [16][17][18][19][20]. However, DPs or EPs of backscattering in optics can be achieved inoptical structures with a few defects or scatterers individually controlled [21][22][23].While in active cavities with multiple quantum emitters, the quantum emitters affect the cavity mode as scatterers themselves [24,25]. The random positions of multiple emitters cause the system to be hard to control. More importantly, the multiple scatterers result in the symmetric backscattering in a single microdisk [26,27]. The symmetric backscattering forbids any degeneracy with only trivial eigenstates, thus the coherent interface between electrons and photons at DPs is hard to achieve.Single microdisks have two-dimensional Hamiltonians based on the clockwise (CW) and counterclockwise (CCW) modes [28]. The symmetric backscattering results in the splitting between eigenstates, corresponding to the absolute value of backscattering coupling strength.Previous works on active microdisks mainly focused on the splitting in the spectrum, and further investigations are limited by the low controllability [29][30][31]. In contrast, two strongly coupled microdisks have supermodes with four-dimensional Hamiltonians. The detuning between microdisks can be controlled, during which not only the absolute value but also the sign of backscattering coupling strength can be investigated. This feature makes...

show abstract

Emerging opportunities for ultra-high Q whispering gallery mode microcavities

Cited by 59 publications

References 22 publications

Controllable Kerr and Raman-Kerr frequency combs in functionalized microsphere resonators

Controllable Kerr and Raman-Kerr frequency combs in functionalized microsphere resonators

Single‐Crystalline Perovskite Microlasers for High‐Contrast and Sub‐Diffraction Imaging

Diabolical points in coupled active cavities with quantum emitters

Contact Info

Product

Resources

About