Sub-attonewton force detection at millikelvin temperatures

被引：372

作者：

Mamin, HJ ^{[1
]}

Rugar, D ^{[1
]}

机构：

[1] IBM Corp, Almaden Res Ctr, Div Res, San Jose, CA 95120 USA

来源：

APPLIED PHYSICS LETTERS | 2001年 / 79卷 / 20期

关键词：

D O I：

10.1063/1.1418256

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A 290-nm-thick single-crystal silicon cantilever has been cooled in vacuum to a temperature of 110 mK in order reduce its thermal motion and thereby improve the achievable force resolution. Since the thermal conductivity of the silicon cantilever is extremely low at millikelvin temperatures, an improved optical fiber interferometer was developed to measure the subangstrom thermal motion with optical powers as low as 2 nW. At the lowest temperature, the cantilever exhibited a quality factor of 150 000 and achieved a noise temperature of 220 mK, with a corresponding force noise of 820 zN in a 1 Hz bandwidth. (C) 2001 American Institute of Physics.

引用

页码：3358 / 3360

页数：3

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