Spectral singularities of a complex spherical barrier potential and their optical realization

Mostafazadeh A., Sarisaman M.

PHYSICS LETTERS A, cilt.375, sa.39, ss.3387-3391, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 375 Sayı: 39
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.physleta.2011.07.052
  • Dergi Adı: PHYSICS LETTERS A
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.3387-3391
  • Anahtar Kelimeler: Complex potential, Spectral singularity, Zero-width resonance, Gain medium, Threshold gain, Spherical dye laser
  • İstanbul Üniversitesi Adresli: Hayır

Özet

The mathematical notion of a spectral singularity admits a physical interpretation as a zero-width resonance. It finds an optical realization as a certain type of lasing effect that occurs at the threshold gain. We explore spectral singularities of a complex spherical barrier potential and study their realization as transverse spherical electromagnetic waves emitted by a gain medium with a spherical geometry. In particular, for a typical dye laser material, we obtain a lower bound on the size of the gain medium for the occurrence of this kind of spectral singularities. (C) 2011 Elsevier B.V. All rights reserved.