Samuel Kalish

Boston University | BU · Department of Physics

We introduce a class of unidirectional lasing modes associated with the frozen mode regime of non-reciprocal slow-wave structures.1 Such asymmetric modes can only exist in cavities with broken time-reversal and space inversion symmetries. The lasing frequency coincides with a spectral stationary inflection point of the underlying passive structure...

We demonstrate that the interplay of a magneto-optical layer sandwiched between two judiciously balanced gain and loss layers which are both birefringent with misaligned in-plane anisotropy, induces unidirectional electromagnetic modes. Embedding one such optically active non-reciprocal unit between a pair of birefringent Bragg reflectors, results...

The scattering properties of randomly layered optical media with PT-symmetric index of refraction are studied using the transfer-matrix method. We find that the transmittance decays exponentially as a function of the system size, with an enhanced rate ξγ(W)−1=ξ0(W)−1+ξγ(0)−1, where ξ0(W) is the localization length of the equivalent passive random m...

The localization properties of randomly layered optical media with PT-symmetric refraction index are studied both theoretically and numerically using the transfer-matrix method. The transmission coefficient decays exponentially as a function of the system size, with a rate ξγ(W)-1=ξ0(W)-1+ξγ(0)-1, where ξ0(W) is the localization length of the equiv...