tailieunhanh - Enhancement of lasing emission in the metallic coated microsphere cavity based on Er-doped silica glasses

In this paper, we present a review of enhancement and wavelength shift of abnormal upconversion green light emission from erbium ions doped in silica with narrow linewidth in the metallic-coated microsphere cavity. Although the phenomenon of the 537 nm- green light emission is not yet understood, its enhancement of several orders of magnitude seems to be due to the excitation of plasmons. The metallic-coated microsphere cavity has led to the lowest threshold so far observed in microsphere cavity lasers from mW to 60 nW. By combining microcavity and surface plasmonic enhancement effect the researchers have created a new kind of photonic devices. | Communications in Physics, Vol. 25, No. 3 (2015), pp. 195-201 DOI: ENHANCEMENT OF LASING EMISSION IN THE METALLIC-COATED MICROSPHERE CAVITY BASED ON Er-DOPED SILICA GLASSES PHAM VAN HOI, NGUYEN THE ANH, AND NGUYEN THI THU TRANG Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Rd., Cau Giay Dist., Hanoi, Vietnam LE HUU THANG SMEDEC1, STAMEQ 8 Hoang Quoc Viet Rd. Cau Giay Dist., Hanoi, Vietnam NGUYEN VAN AN College of Sciences, Hue University, 77 Nguyen Hue str., Hue city, Vietnam E-mail: hoipv@ Received 27 August 2015 Accepted for publication 30 September 2015 Abstract. In this paper, we present a review of enhancement and wavelength shift of abnormal upconversion green light emission from erbium ions doped in silica with narrow linewidth in the metallic-coated microsphere cavity. Although the phenomenon of the 537 nm- green light emission is not yet understood, its enhancement of several orders of magnitude seems to be due to the excitation of plasmons. The metallic-coated microsphere cavity has led to the lowest threshold so far observed in microsphere cavity lasers from mW to 60 nW. By combining microcavity and surface plasmonic enhancement effect the researchers have created a new kind of photonic devices. Keywords: microcavity, upconversion emission, Er-doped silica glass, surface plasmonics. I. INTRODUCTION The conversion of infrared light to visible light through energy upconversion in erbiumdoped materials has increased considerably with the applications of compact visible sources in various fields [1–6]. Er-doped silica glass is used commercially in optical fibre amplifiers, but it has limitation by small optical cross section of the Er transitions and long radiative lifetime. The Er-doped silica microcavities can overcome these limitations. In microcavity the photon is confined in the region where the Er-ions are embedded. When the confined photon is in .