Controlling multipolar radiation with symmetries for electromagnetic bound states in the continuum

Lepetit, Thomas; Kanté, Boubacar

doi:10.1103/physrevb.90.241103

Cited by 105 publications

(73 citation statements)

References 37 publications

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“…In acoustics they have been studied in multi-resonant cavities 103,128 . In optics they have been studied in multi-resonant dielectric objects in microwave waveguides 129,130 , and the "dark state laser" described in ref. 131 is also a Friedrich-Wintgen BIC if one were to ignore the intrinsic radiation of the micro-ring cavities.…”

Section: Friedrich-wintgen Bic (Through Coupled Resonances)mentioning

confidence: 99%

Bound states in the continuum

et al. 2016

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Bound states in the continuum are waves that, defying conventional wisdom, remain localized even though they coexist with a continuous spectrum of radiating waves that can carry energy away. Their existence was first proposed in quantum mechanics and, being a general wave phenomenon, later identified in electromagnetic, acoustic, and water waves. They have been studied in a wide variety of material systems such as photonic crystals, optical waveguides and fibers, piezoelectric materials, quantum dots, graphene, and topological insulators. This Review describes recent developments in this field with an emphasis on the physical mechanisms that lead to these unusual states across the seemingly very different platforms. We discuss recent experimental realizations, existing applications, and directions for future work.

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Section: Friedrich-wintgen Bic (Through Coupled Resonances)mentioning

confidence: 99%

Bound states in the continuum

et al. 2016

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“…Recently, it was understood that BICs are intrinsically a wave phenomenon and are not restricted to the realm of quantum mechanics. They have since been shown to occur in many different fields of wave physics including acoustics, microwaves, and nanophotonics [6][7][8][9][10][11][12][13][14]. However, experimental observations of bound states in the continuum have been limited to passive systems.…”

mentioning

confidence: 99%

“…These eigenvalues exist in a multidimensional space (hyperspace), but in a given frequency range, the investigation can be reduced to a finite number of variables, limiting the complexity of the effective Hamiltonian [7]. When eigenvalues come close to crossing as a function of a geometrical parameter that modifies the system, avoided resonance crossing (ARC) occurs, i.e., eigenvalues repel each other in the entire complex plane [17][18].…”

mentioning

confidence: 99%

Lasing action from photonic bound states in continuum

Kodigala

Lepetit

et al. 2017

Nature

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Abstract-Cavities play a fundamental role in wave phenomena from quantum mechanics to electromagnetism and dictate the spatiotemporal physics of lasers. In general, they are constructed by closing all "doors" through which waves can escape. We report, at room temperature, a bound state in the continuum laser that harnesses optical modes residing in the radiation continuum but nonetheless may possess arbitrarily high quality factors. These counterintuitive cavities are based on resonantly trapped symmetry-compatible modes that destructively interfere. Our experimental demonstration opens exciting avenues towards coherent sources with intriguing topological properties for optical trapping, biological imaging, and quantum communication.

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“…Signatures of acoustic BICs were observed experimentally several decades ago 3 , but only after the recent theoretical studies and landmark experiments conducted in classical photonic systems the implications of the almost century-old concept were properly appreciated, stimulating deeper understanding over its origin [9][10][11] and inspiring new schemes 12-14 and applications [15][16][17] .…”

mentioning

confidence: 99%

“…Many decades after their original prediction 1,2 and early observations in acoustic systems 3 , such states have been recently demonstrated in photonic structures with engineered geometries [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] . In this paper we put forward a mechanism, based on waveguiding structures containing anisotropic birefringent materials, which affords the existence of BICs that exhibit fundamentally-new properties.…”

mentioning

confidence: 99%

Anisotropy-induced photonic bound states in the continuum

2017

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Bound states in the continuum (BICs) are radiationless localized states embedded in the part of the parameter space that otherwise corresponds to radiative modes. Many decades after their original prediction 1,2 and early observations in acoustic systems 3 , such states have been recently demonstrated in photonic structures with engineered geometries [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] . In this paper we put forward a mechanism, based on waveguiding structures containing anisotropic birefringent materials, which affords the existence of BICs that exhibit fundamentally-new properties. In particular, anisotropy-induced BICs may exist in symmetric as well as in asymmetric geometries; they form in tunable angular propagation directions; their polarization may be pure transverse-electric, pure transverse-magnetic or full-vector with tunable polarization-hybridity; and they may be the only possible bound states of properly designed structures, thus appearing as a discrete, isolated bound state embedded in a whole sea of radiative states. 2Bound states in the continuum were originally predicted in 1929 by von Neumann and Wigner as discrete fully-bounded quantum states with energies above the continuum of the corresponding Hamiltonian. Signatures of acoustic BICs were observed experimentally several decades ago 3 , but only after the recent theoretical studies and landmark experiments conducted in classical photonic systems the implications of the almost century-old concept were properly appreciated, stimulating deeper understanding over its origin [9][10][11] and inspiring new schemes 12-14 and applications [15][16][17] .BICs discovered to date are almost-pure transverse-electric (TE) or transversemagnetic (TM) waves 4,[7][8][9][19][20][21] , namely with a negligible fraction of energy being carried by the respective orthogonal polarization. The corresponding trapping mechanism can thus be intuitively viewed as a scalar or spinor potential. In contrast, photonic structures containing anisotropic media can support bound states that, in general, involve the fullvector electric and magnetic field components. This important feature opens up the possibility to search for full-vector BICs that cannot exist in scalar analogies. In this paper we explore the concept and expose its potential.By and large, coupling localized states with a coexisting radiative continuum results in energy being shed away and thus in unbound states that decay and fade away during propagation. Bound states can only exist when such transverse radiative leakage is suppressed by a suitable mechanism. Here we address the existence of such mechanism in optical waveguiding structures fabricated in anisotropic media. We restrict ourselves to the simplest structures fabricated in birefringent uniaxial natural materials, the optical axes of the crystals are set to lie on the waveguide plane forming an angle θ with the wave propagation direction, θ is set to be equal for all materials, and we set the cladding to be an isotropic medium (Fig. ...

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Controlling multipolar radiation with symmetries for electromagnetic bound states in the continuum

Cited by 105 publications

References 37 publications

Bound states in the continuum

Bound states in the continuum

Lasing action from photonic bound states in continuum

Anisotropy-induced photonic bound states in the continuum

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