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- Yoshihiro Akahane, Takashi Asano, Bong-Shik Song, Susumu Noda
- Nature
- 2003

Photonic cavities that strongly confine light are finding applications in many areas of physics and engineering, including coherent electron-photon interactions, ultra-small filters, low-threshold lasers, photonic chips, nonlinear optics and quantum information processing. Critical for these applications is the realization of a cavity with both high quality… (More)

- Yoshihiro Akahane, Takashi Asano, Bong-Shik Song, Susumu Noda
- Optics express
- 2005

A photonic nanocavity with a high Q factor of 100,000 and a modal volume V of 0.71 cubic wavelengths, is demonstrated. According to the cavity design rule that we discovered recently, we further improve a point-defect cavity in a two-dimensional (2D) photonic crystal (PC) slab, where the arrangement of six air holes near the cavity edges is fine-tuned. We… (More)

- Toshitsugu Uesugi, Bong-Shik Song, Takashi Asano, Susumu Noda
- Optics express
- 2006

We investigated the characteristics of an ultra-high-Q photonic nanocavity (Q = ~230,000 and modal volume = ~1.2 cubic wavelengths) at various input light powers. The cavity characteristics were red-shifted as the input power increased. This nonlinearity could be explained by coupled-mode theory, taking into account two-photon absorption, the associated… (More)

- Kyosuke Sakai, Eiji Miyai, Susumu Noda
- Optics express
- 2007

We present a useful framework based on the coupled-wave theory, through which we can survey the resonant modes of TM polarization in 2D photonic-crystal lasers and understand their properties in detail. Through numerical calculations, we clarify their threshold gains, deviations from the Bragg frequency and field distributions. We find that the lasing mode… (More)

- Masayuki Fujita, Shigeki Takahashi, Yoshinori Tanaka, Takashi Asano, Susumu Noda
- Science
- 2005

Inhibiting spontaneous light emission and redistributing the energy into useful forms are desirable objectives for advances in various fields, including photonics, illuminations, displays, solar cells, and even quantum-information systems. We demonstrate both the "inhibition" and "redistribution" of spontaneous light emission by using two-dimensional (2D)… (More)

- Kenji Ishizaki, Susumu Noda
- Nature
- 2009

In three-dimensional (3D) photonic crystals, refractive-index variations with a periodicity comparable to the wavelength of the light passing through the crystal give rise to so-called photonic bandgaps, which are analogous to electronic bandgaps for electrons moving in the periodic electrostatic potential of a material's crystal structure. Such 3D photonic… (More)

- Hiroshi Sekoguchi, Yasushi Takahashi, Takashi Asano, Susumu Noda
- Optics express
- 2014

We have investigated absorption losses due to surface water adsorbed on the surface of silicon heterostructure nanocavities with quality (Q) factors of several million. Measurements performed while changing the ambient humidity that the nanocavity is exposed to show that the Q value depends linearly on humidity. We also reveal that chemical treatment to… (More)

- Yuki Taguchi, Yasushi Takahashi, Yoshiya Sato, Takashi Asano, Susumu Noda
- Optics express
- 2011

We have measured the quality (Q) factors and resonant wavelengths for 80 photonic crystal nanocavities with the same heterostructure. In this statistical evaluation, the Q factors varied according to a normal distribution centered at 3 million and ranging between 2.3 million and 3.9 million. The resonant wavelengths also fluctuated but with a standard… (More)

- Kyosuke Sakai, Jianglin Yue, Susumu Noda
- Optics express
- 2008

We present a coupled-wave model for a triangular-lattice two-dimensional (2D) photonic crystal (PC) with a transverse electric (TE) polarization and derive a set of coupled-wave equations. We use these equations to obtain analytic expressions that describe the relations between the resonant mode frequencies and the coupling constants. We calculate the… (More)

- Y. Nakamura, Susumu Noda, Taizo Masuhara, Shoko Ito-Kuwa, K. Nakamura, Dr. S. Aoki
- Mycopathologia
- 1993

Sprague-Dawley rats were inoculated intravenously (i.v.) withCandida albicans, and limb joints showing signs ofCandida-induced arthritis were subjected to radiographic and histologic examination. New bone formation and bone resorption were morbidly enhanced in bones sampled from the arthritic joints. Sparsely distributed needle-shaped calcified deposits… (More)