Waveguide resonator with high quality factor excited through the subwavelength slit

The excitation of standing TM wave by subwavelength slit in the single-mode waveguide resonator with metallic borders is considered. In the presented structure the entrance energy through the slit strongly depends on the incident wavelength. Consequently the Q-factor of the system calculated by using finite element method reaches up to values of 10⁴ in the near infrared region. The significant change of the scattered wave energy is achieved by changing the dielectric constant value by 5×10^-4 or the resonator thickness by 0.5 nm. The sensitivity of the system from the parameters of structure allows using the system in various applications such as devices of optical bistability, modulators, and optical sensors of vibration, displacement and temperature