Cross-polarization coupling of whispering-gallery modes due to the spin–orbit interaction of light

Rosenberger, A. T.; Dale, Elijah; Bui, Khoa V.; Gonzales, Erik K.; Ganta, D.; Ke, Limu; Rajagopal, Sreekul R.

doi:10.1364/ol.44.004163

Cited by 17 publications

(25 citation statements)

References 29 publications

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“…To understand the third factor, think of mj as the number of reflections of the light in the WGM in each round trip; this is the Eikonal approximation mentioned in Ref. 13. As the number of reflections decreases, the angle of incidence (measured from the normal to the resonator surface) also decreases, increasing the TE-TM difference in the phase change on reflection.…”

Section: Discussionmentioning

confidence: 99%

“…16 Tc and b can be calculated for a representative set of mode numbers that give values of Tc and b similar to those determined experimentally. 13 To understand why b  1, i.e., CPC is nonreciprocal, first consider another type of coupling, that between a tapered-fiber mode and a microresonator WGM.…”

Section: Simplified Theorymentioning

confidence: 99%

“…Now, we assume that βjz is proportional not only to nj but also to the axial extent of the mode (to lowest-order approximation). Since the axial dependence of the field amplitude is like a harmonic oscillator wave function, 13,19,20 it is proportional to the square root of qj + ½, where qj is mode j's axial mode number, the number of axial field zeroes. So finally we have an estimate of the value of the nonreciprocal parameter:…”

Section: Simplified Theorymentioning

confidence: 99%

See 2 more Smart Citations

Nonreciprocal cross-polarization coupling in whispering-gallery microresonators

Sandoval¹,

Haq²,

Rosenberger³

2023

Quantum Sensing, Imaging, and Precision Metrology

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Coupling of light from a microresonator TE mode to a coresonant TM mode will have a different strength than that of coupling from the TM mode to the TE mode. This coupling nonreciprocity, deriving from the optical spin-orbit interaction, is modeled numerically and confirmed experimentally by observing coupled-mode induced transparency and Autler-Townes splitting. By measuring the throughput spectrum in both polarizations when the input directly excites modes of only one polarization, the coupling strengths in both directions can be determined simultaneously by fitting to the numerical model. Some examples and implications are discussed here.

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Section: Discussionmentioning

confidence: 99%

Section: Simplified Theorymentioning

confidence: 99%

Section: Simplified Theorymentioning

confidence: 99%

See 1 more Smart Citation

Nonreciprocal cross-polarization coupling in whispering-gallery microresonators

Sandoval¹,

Haq²,

Rosenberger³

2023

Quantum Sensing, Imaging, and Precision Metrology

View full text Add to dashboard Cite

show abstract

“…In addition, nanostructured composite systems theoretically allow for the design of metamaterials tailored for specific optical polarization properties, behaving as an almost perfect linearly dichroic system, quarter-wave plate, or circular polarizer [16]. Besides, the polarization-controlled manipulation of light has been demonstrated in the coupling of the whispering-gallery modes of a microresonator [17]. The quest for novel methods to realize functional assemblies of nanostructures characterized by conveniently tailored optical responses ceaselessly triggers the interest of scientists from many different areas: in this context, semiconductor nanowires (NWs) are emerging as a very promising class of quasi one-dimensional systems ideally suited for building up photonic platforms [18,19,20,21].…”

Section: Introductionmentioning

confidence: 99%

Strong Modulations of Optical Reflectance in Tapered Core–Shell Nanowires

et al. 2019

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Random assemblies of vertically aligned core–shell GaAs–AlGaAs nanowires displayed an optical response dominated by strong oscillations of the reflected light as a function of the incident angle. In particular, angle-resolved specular reflectance measurements showed the occurrence of periodic modulations in the polarization-resolved spectra of reflected light for a surprisingly wide range of incident angles. Numerical simulations allowed for identifying the geometrical features of the core–shell nanowires leading to the observed oscillatory effects in terms of core and shell thickness as well as the tapering of the nanostructure. The present results indicate that randomly displaced ensembles of nanoscale heterostructures made of III–V semiconductors can operate as optical metamirrors, with potential for sensing applications.

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“…This enables a coupling between the light's orbital motion in the resonator and its polarization (spin of light) state that is known as spin-orbit interaction of light [25][26][27]. It has been studied in different contexts [24,[28][29][30][31][32][33], and a special focus was given to asymmetric microcavities and the role of anisotropies or inhomegeneties [15] as well as the interpretation in terms of geometric phases [34][35][36][37].…”

mentioning

confidence: 99%

Spin-orbit interaction of light in three-dimensional microcavities

Kreismann,

Hentschel

2020

Preprint

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We investigate the spin-orbit coupling of light in three-dimensional cylindrical and tube-like whispering gallery mode resonators. We show that its origin is the transverse confinement of light in the resonator walls, even in the absence of inhomogeneities or anisotropies. The spin-orbit interaction results in elliptical far-field polarization (spin) states and causes spatial separation of polarization handedness in the far field. The ellipticity and spatial separation are enhanced for whispering gallery modes with higher excitation numbers along the resonator height. We analyze the asymmetry of the ellipticity and the tilt of the polarization orientation in the far field of conelike microcavities. Furthermore, we find a direct relationship between the tilt of the polarization orientation in the far field and the local inclination of the resonator wall. Our findings are based on FDTD-simulations and are supported by three-dimensional diffraction theory.

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Cross-polarization coupling of whispering-gallery modes due to the spin–orbit interaction of light

Cited by 17 publications

References 29 publications

Nonreciprocal cross-polarization coupling in whispering-gallery microresonators

Nonreciprocal cross-polarization coupling in whispering-gallery microresonators

Strong Modulations of Optical Reflectance in Tapered Core–Shell Nanowires

Spin-orbit interaction of light in three-dimensional microcavities

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