This paper examines electromagnetic energy transmission through a narrow slot in thick conducting plate when plane wave is incident to the slot. The creates waveguide structure. From perspective of cutoff frequency, characteristics are classified into three modes. cavity resonance (TCR) mode range above depends on thickness, and peak cross-sections (TCSs) appear periodically along known as Fabr...

We present our latest results on the ultrasensitive molecular overtone spectroscopy using the cavity-enhanced frequency modulation (FM) technique. The principle of this technique makes use of a high-finesse external cavity to enhance the intrinsic resonance contrast, while an FM modulation approach provides shot-noise limited signal recovery. Working with a 1.064 m Nd:YAG laser, we have obtain...

The photoluminescence spectra from a quantum-dot exciton weakly-coupled to a planar photonic-crystal cavity is experimentally investigated by temperature tuning. Significant resonance shifts of the cavity mode are observed as the cavity mode spectrally approaches that of the exciton mode, showing the appearance of cavity-to-exciton attraction or mode pulling. Cavity-mode spectral shifts are als...

A high-finesse optical cavity was employed to perform highly sensitive spectroscopy of molecular oxygen at wavelengths near 763 nm. An equivalent absorption length of ;1 km was obtained by a 26-cm-long optical cavity with a finesse of 6000. An extended cavity diode laser was frequency locked to the cavity, and pure absorption profiles were recovered by monitoring of the cavity transmission duri...

A transonic air stream flowing over a rectangular cavity or enclosure is unsteady. At certain flow conditions, large scale oscillations develop in the shear layer which, for an open cavity, spans across the whole enclosure. The convected shear layer instabilities interact with the cavity geometry, they generate resonance, and induce large amplitude wall pressure fluctuations, aerodynamic pressu...

Flow past the opening of a deep cavity can excite and sustain longitudinal acoustic modes resulting in large pressure fluctuations and loud tone generation. An analytic model of the interaction of the free stream with the acoustic flow field using concentrated vortices in the shear layer is proposed. The model includes a computation of the power transferred by the traveling vortices to the acou...

We demonstrate a silicon carbide (SiC) microdisk resonator with an intrinsic optical quality factor of 6.19×10(3), fabricated on the 3C-SiC-on-Si platform. We characterize the temperature dependence of the cavity resonance and obtain a thermo-optic coefficient of 2.92×10(-5)/K for 3C-SiC. Our simulations show that the device exhibits great potential for cavity optomechanical applications.

We present three high finesse tunable monolithic fiber Fabry-Perot cavities (FFPCs) with passive mechanical stability. The mirrors are fixed inside slotted glass ferrules, which guarantee an inherent alignment of the resonators. An attached piezoelectric element enables fast tuning FFPC resonance frequency over entire free-spectral range for two designs. Stable locking cavity is achieved sub-He...

Abstract In this paper, we demonstrate the first example of phonon-assisted hot luminescence (PAHL) emission from silicon (Si) spheres (diameter > 100nm) without using plasmonic effect or quantum confinement effect. Instead, excite Si by a strong thin-film-cavity-enhanced magnetic dipole resonance. The thin-film cavity (80 nm SiO 2 /Ag) shows co-enhancement with resonance sphere = 120 nm). c...

Angiosarcoma of the nasal cavity is extremely rare. We present a case of angiosarcoma of the nasal cavity in an eight-year-old boy. He was treated with medial maxillectomy via lateral rhinotomy. The histological diagnosis was confirmed by immunohistological stain with Factor VIII-like antigen. Magnetic resonance imaging (MRI) was useful in determining the extent of the tumour.