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Ultrahigh-Q nanocavity with 1D photonic gap
M Notomi1, E Kuramochi, H Taniyama
1NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 2430198, Japan. notomi@nttbrl.jp
Optics Express
|July 24, 2008
Summary
Researchers achieved ultrahigh-Q, wavelength-sized optical cavities using only 1D periodicity. This breakthrough offers a simpler approach to strong light confinement compared to existing 2D or 3D photonic band gap methods.
Area of Science:
- Photonics
- Optical Cavities
- Nanophotonics
Background:
- Existing wavelength-sized cavities with high Q values (~10^8) typically rely on complex 2D or 3D photonic band gaps for light confinement.
- These structures present fabrication challenges and limitations in practical applications.
Purpose of the Study:
- To numerically demonstrate the feasibility of achieving ultrahigh-Q, wavelength-sized cavities using simplified 1D periodicity.
- To explore an alternative approach to strong light confinement in optical cavities.
Main Methods:
- Numerical simulations were employed to design and analyze the proposed cavity structure.
- The effective mode volume (V(eff)) and theoretical Q factor were calculated to assess cavity performance.
Main Results:
- An ultrahigh theoretical Q factor of 2.0x10^8 was achieved.
- A wavelength-sized effective mode volume (V(eff) ~ 1.4 (lambda/n)^3) was demonstrated.
- The cavity design utilizes only 1D periodicity, significantly simplifying the structure.
Conclusions:
- Achieving ultrahigh-Q, wavelength-sized cavities is possible with 1D periodicity alone.
- This 1D approach offers a promising alternative to more complex 2D/3D photonic band gap structures.
- The findings pave the way for simpler fabrication and potential applications of high-performance optical cavities.
