Billion Q-factor in silicon WGM resonators

Research of Constructive and Technological Methods for Forming a Silicon Disk Resonator with Whispering Gallery Modes

“…This makes it possible to fabricate a high-quality WGM resonator of a smaller size, thereby leveling the effect of optical linear losses in silicon. This assumption is also confirmed by studies proving the possibility of achieving a Q-factor of 1,2•109 in silicon optical resonators at a wavelength of 1550 μm [20].…”

Kerr-Raman Optical Frequency Combs in Silica Microsphere Pumped Near Zero Dispersion Wavelength

“…Optical frequency combs (OFCs) produced in whispering gallery mode microresonators (WGMRs) are demanded in basic science and in a huge number of applications, including advanced telecommunication systems [1,2] and quantum optical communication [3,4], and can lead to great advances in the entangled states generation for quantum computation [5]. The currently available technologies allow manufacturing high Q-factor WGMRs of different shapes based on various materials [6][7][8][9][10][11][12][13]. On-chip WGMRs have been intensively developed and investigated [6], but silica microspheres (MSs) are also a very convenient platform for studying nonlinear phenomena and demonstrating proof-ofconcepts as they can be easily produced from standard optical fibers, their dispersion can be controlled by choosing their diameters, and the nonlinear dynamics of intracavity radiation for them can be described as for other WGMR types in the framework of the Lugiato-Lefever equation (LLE) [6].…”

Terahertz Gas-Phase Spectroscopy Using a Sub-Wavelength Thick Ultrahigh-Q Microresonator

“…To achieve sufficiently low losses (high Q-factors), the resonators must be formed from a single piece of material. While such monolithic resonators have been extensively studied at optical frequencies [15][16][17][18][19][20][21][22], they remain largely unexplored in the THz domain. It is only very recently that this concept has been translated into the THz domain [23][24][25][26][27][28][29][30][31], achieving unprecedented Q-factors more than two orders of magnitude higher compared to previous systems [29].…”