Limits to superweak amplification of beam shifts

Götte, Jörg B.; Dennis, Mark R.

doi:10.1364/ol.38.002295

Cited by 42 publications

(40 citation statements)

References 20 publications

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“…Since the adiabatic parameter was not too small in our experiment, we preformed additional calculations of time shifts, which take into account the second-derivative terms in the Taylor expansion of the transmission coefficient T ω ( ). These calculations are presented in the Supplementary Note 2, and the results are similar to the analogous beam-shift calculations by Götte and Dennis [48]. The refined dependences D t ν c ,γ ( ) are plotted in Fig.…”

Section: Resultssupporting

confidence: 76%

Anomalous time delays and quantum weak measurements in optical micro-resonators

Asano¹,

Bliokh²,

Bliokh³

et al. 2016

Nat Commun

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Quantum weak measurements, wavepacket shifts and optical vortices are universal wave phenomena, which originate from fine interference of multiple plane waves. These effects have attracted considerable attention in both classical and quantum wave systems. Here we report on a phenomenon that brings together all the above topics in a simple one-dimensional scalar wave system. We consider inelastic scattering of Gaussian wave packets with parameters close to a zero of the complex scattering coefficient. We demonstrate that the scattered wave packets experience anomalously large time and frequency shifts in such near-zero scattering. These shifts reveal close analogies with the Goos–Hänchen beam shifts and quantum weak measurements of the momentum in a vortex wavefunction. We verify our general theory by an optical experiment using the near-zero transmission (near-critical coupling) of Gaussian pulses propagating through a nano-fibre with a side-coupled toroidal micro-resonator. Measurements demonstrate the amplification of the time delays from the typical inverse-resonator-linewidth scale to the pulse-duration scale.

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Section: Resultssupporting

confidence: 76%

Anomalous time delays and quantum weak measurements in optical micro-resonators

Asano¹,

Bliokh²,

Bliokh³

et al. 2016

Nat Commun

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show abstract

“…We note that, in this condition, the degree of asymmetry is smaller than the above case. In fact, in the case of elliptical polarization beam with its long axis along to the horizontal direction, there exists a relatively large spatial Imbert-Fedorov shift [38].…”

Section: Experimental Observation and Discussionmentioning

confidence: 99%

Unveiling the photonic spin Hall effect with asymmetric spin-dependent splitting

Zhou¹,

Ling²

2016

Opt. Express

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The photonic spin Hall effect (SHE) manifests itself as the spin-dependent splitting of light beam. Usually, it shows a symmetric spin-dependent splitting, i.e., the left- and right-handed circularly polarized components are equally separated in position and intensity for linear polarization incidence. In this paper, we theoretically propose an asymmetric spin-dependent splitting at an air-glass interface under the illumination of elliptical polarization beam and experimentally demonstrate it with the weak measurement method. The left- and right-handed circularly polarized components show expectedly unequal intensity distributions and unexpectedly different spin-dependent shifts. Remarkably, the asymmetric spin-dependent splitting can be modulated by adjusting the handedness of incident polarization. The inherent physics behind this interesting phenomenon is attributed to the additional spatial Imbert-Fedorov shift. These findings offer us potential methods for developing new spin-based nanophotonic applications.

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“…On the other hand, supposing that the preselected state |H is incident near the Brewster angle, the operator exp(−ik yÂ δ H ) cannot be expanded as 1 − ik yÂ δ H due to the strong coupling [47][48][49][50]. Therefore, the weak value A w in Eq.…”

Section: Theoretical Modelmentioning

confidence: 99%

Modified weak measurements for the detection of the photonic spin Hall effect

Chen

Zhou

et al. 2015

Phys. Rev. A

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Weak measurement is an important technique for the detection of the tiny spin-dependent splitting in photonic spin Hall effect. The weak measurement is only valid when the probe wave function remains almost undisturbed during the procedure of measurements. However, it does not always satisfy such condition in some practical situations, such as in the strong-coupling regime or when the preselected and postselected states are nearly orthogonal. In this paper, we develop a modified weak measurement for the detection of the photonic spin Hall effect when the probe wave function is distorted. We find that the measuring procedure with preselected and postselected ensembles is still effective. This scheme is important for us to detect the photonic spin Hall effect in the case where neither weak nor strong measurements can detect the spin-dependent splitting. The modified theory is valid not only in the weak-coupling regime but also in the strong-coupling regime, and especially in the intermediate regime. The theoretical models of conventional weak measurements and modified weak measurements are established and compared. We show that the experimental results coincide well with the predictions of the modified theory.

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Limits to superweak amplification of beam shifts

Cited by 42 publications

References 20 publications

Anomalous time delays and quantum weak measurements in optical micro-resonators

Anomalous time delays and quantum weak measurements in optical micro-resonators

Unveiling the photonic spin Hall effect with asymmetric spin-dependent splitting

Modified weak measurements for the detection of the photonic spin Hall effect

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