Positive and negative giant Goos–Hänchen shift in a near-symmetric layered medium for illumination from opposite ends

Kumari, Madhuri; Gupta, S. Dutta

doi:10.1016/j.optcom.2011.10.100

Cited by 16 publications

(15 citation statements)

References 26 publications

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“…Let us stress that the distorted beam contains information about the amplitude and phase of the complex reflection coefficient. Such Gaussian beam splittings have been reported in literature [9,15] and observed in experiment [16].…”

Section: Introductionsupporting

confidence: 80%

“…In the first case we expect non reciprocal phase with identical amplitude reflection for illumination from opposite ends. Non-reciprocal phase is known to lead to non identical GH shift [9]. Here we show that beam profile as well exhibits this non-reciprocity.…”

Section: Resultssupporting

confidence: 53%

“…The asymmetry reported in Ref. [9] on sign reversal of the GH shift was a consequence of the non-reciprocity relations derived earlier [13][14]. The non-reciprocity in a lossless asymmetric structure is expressed through the non-reciprocal phases and hence nonreciprocal GH shift, while the intensity reflection is identical from both ends.…”

Section: Introductionmentioning

confidence: 67%

“…There have also been reports on temperature sensing and other sensing devices making use of GH shift [7][8]. Very recently a coupled waveguide structure with slight asymmetry was investigated to show GH shift with opposite signs for illumination from opposite ends [9]. A resonant tunneling geometry (see Fig.…”

Section: Introductionmentioning

confidence: 99%

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Novel biosensor for detecting hemoglobin and its oxidation state based on nonreciprocity in a coupled waveguide system

2012

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We study the reflection of a tightly focused Gaussian beam off a near symmetric resonant tunneling structure comprising two identical coupled waveguides. The coupled waveguides are loaded on each side by a spacer layer and a high index prism. Reflection of a Gaussian beam from such a resonant structure is associated with beam distortion and even beam splitting. We start with the distortion of the beam profile for a symmetric structure as a function of various parameters of the system. The broken spatial symmetry is introduced through the reference channel on one side and the sample channel on the other side as spacer layers. We monitor the dip in the beam profile when the two channels are filled with the sample and the reference liquid. We show that presence and absence of hemoglobin and its oxygenation states can be quantified by looking at the beam profile dip. Our results may find applications in high resolution sensing.

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Section: Introductionsupporting

confidence: 80%

Section: Resultssupporting

confidence: 53%

Section: Introductionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

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Novel biosensor for detecting hemoglobin and its oxidation state based on nonreciprocity in a coupled waveguide system

2012

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“…Therefore, both nonlinearity and some kinds of symmetry breaking mechanism are essential for the real non-reciprocal propagation. In particular, the optical isolators or diodes 23 have been realized by harvesting the properties of nonlinearity and asymmetry [24][25][26][27][28][29] . The enhancement of nonreciprocal transmission via cascading has also been studied 30 .…”

mentioning

confidence: 99%

Non-Reciprocal Geometric Wave Diode by Engineering Asymmetric Shapes of Nonlinear Materials

李念北

任捷

2014

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Unidirectional nonreciprocal transport is at the heart of many fundamental problems and applications in both science and technology. Here we study the novel design of wave diode devices by engineering asymmetric shapes of nonlinear materials to realize the function of non-reciprocal wave propagations. We first show analytical results revealing that both nonlinearity and asymmetry are necessary to induce such non-reciprocal (asymmetric) wave propagations. Detailed numerical simulations are further performed for a more realistic geometric wave diode model with typical asymmetric shape, where good non-reciprocal wave diode effect is demonstrated. Finally, we discuss the scalability of geometric wave diodes. The results open a flexible way for designing wave diodes efficiently simply through shape engineering of nonlinear materials, which may find broad implications in controlling energy, mass and information transports.T he pursuit of novel devices that are able to manipulate energy, mass and information transmission has stimulated huge interests in widespread physical branches such as phononics 1 , photonics 2-4 and biophysics 5. As one of the most fundamental and applicable devices, the wave diode can rectify non-reciprocal wave propagation, in analogy to electronic p-n junctions, where the transmission coefficient is significantly directiondependent. As such, the device conducts in the forward direction but insulates in the backward one. There are many interesting theoretical proposals for thermal diodes [6][7][8][9][10] , optical diodes 11,12 , spin Seebeck diodes 13,14 and acoustic diodes 15,16 , and many of them have been successfully verified by experiments [2][3][4][17][18][19][20][21] . It has been well established that linear structures are not able to break the reciprocity in reflection-transmission once the time-reversal symmetry is preserved 22 . Therefore, both nonlinearity and some kinds of symmetry breaking mechanism are essential for the real non-reciprocal propagation. In particular, the optical isolators or diodes 23 have been realized by harvesting the properties of nonlinearity and asymmetry [24][25][26][27][28][29] . The enhancement of nonreciprocal transmission via cascading has also been studied 30 . And this nonreciprocal transmission has even been achieved in PT systems 31,32 . Recently, an interesting design of wave diode is proposed 33 , based on the nonreciprocal transmission in a one-dimensional (1D) nonlinear layer structure 11,12 . The model system is described by the discrete nonlinear Schrödinger (DNLS) equation, which is a reasonable approximation for the wave evolution in layered photonic or phononic crystals 34 . The spatially varying coefficients break the mirror reflection symmetry and this non-homogeneity generates the asymmetric wave propagation together with nonlinearity. However, the inhomogeneity of coefficients is not the only way to achieve non-reciprocal wave propagation and also it is usually very hard to design the inhomogeneous coefficient in real materials.To circu...

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Electrically controlled and directional-dependent Goos-Hänchen shift in a non-Hermitian multilayered structure with Dirac semimetal

Hu,

Zhou,

Song

et al. 2024

Optical Materials

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Positive and negative giant Goos–Hänchen shift in a near-symmetric layered medium for illumination from opposite ends

Cited by 16 publications

References 26 publications

Novel biosensor for detecting hemoglobin and its oxidation state based on nonreciprocity in a coupled waveguide system

Novel biosensor for detecting hemoglobin and its oxidation state based on nonreciprocity in a coupled waveguide system

Non-Reciprocal Geometric Wave Diode by Engineering Asymmetric Shapes of Nonlinear Materials

Electrically controlled and directional-dependent Goos-Hänchen shift in a non-Hermitian multilayered structure with Dirac semimetal

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