1,721,055 research outputs found
Optical black hole lasers
Full text linkUsing numerical simulations we show how to realize an optical black hole laser, i.e. an amplifier formed by travelling refractive index perturbations arranged so as to trap light between a white and a black hole horizons. The simulations highlight the main features of these lasers: the growth inside the cavity of positive and negative frequency modes accompanied by a weaker emission of modes that occurs in periodic bursts corresponding to the cavity round trips of the trapped modes. We then highlight a new regime in which the trapped mode spectra broaden until the zero-frequency points on the dispersion curve are reached. Amplification at the horizon is highest for zero-frequencies, therefore leading to a strong modification of the structure of the trapped light. For sufficiently long propagation times, lasing ensues only at the zero-frequency modes
Ultrasound (US) controlled laser-induced interstitial thermo therapy (LITT) for hepatic metastasis
No full textLong-term follow up of octreotide LAR in the treatment of metastasized midgut carcinoids.
No full textEvaluation of ultrasonographic imaging in laser-induced thermotherapy (LITT) in the liver.
No full textEvaluation of ultrasonographic imaging in laser-induced thermotherapy (LITT) in the liver.
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Epimers of doxycycline reveal the potency of tetracyclines in the Tet-on gene expression system is not strictly related to antibacterial activity
No full textUltrasound (US) controlled laser-induced interstitial thermo therapy (LITT) for hepatic metastasis
No full textUltrasonographic guided laser-induced interstitial thermotherapy (LITT) of hepatic metastases
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