Avishek Chowdhury

Avishek Chowdhury is an Application Scientist at Zurich Instruments Germany. He received his PhD from Universite Paris-Saclay on nonlinear dynamics in NOEMS platforms. His experience is in both experimental and theoretical physics with a background in nanomechanics, quantum cavity optomechanics and quantum sensing. At Zurich Instruments, he enjoys discussions on multidisciplinary applications while helping researchers to solve their problems. In his free time, he enjoys spending time with the family, reading books, playing guitar and cooking.

How to Measure Allan Variance with Zurich Instruments Lock-in Amplifiers

28.08.2023

Any measurement resolution is limited by random fluctuations, "noise", of the measured quantities. Practical systems also might experience variations of parameters causing "drifts" in the measurements. Various sources of such noises and drifts may take different time or frequency dependencies. To understand how such fluctuations affect one's measurement, a careful analysis of such noise and drifts must be performed. Discrimination of such noise sources might be performed by performing Allan deviation measurement of discretely sample data. In this blog post, we discuss how to easily measure Allan variance with our Zurich Instruments lock-in amplifier.

Resolved Sideband Measurements of a Microwave Optomechanical Resonator

25.03.2024

Want to measure the motion of a nanomechanical oscillator coupled to a microwave cavity? This blog post shows how it is possible to use a single lock-in amplifier to characterize microwave cavities and determine the motional sidebands with a very simple setup. Furthermore, we also discuss the implementation of homodyne and heterodyne detection with the SHFLI thanks to its multi-demodulator options.

Injection Locking on a GHz NOEMS Platform

03.10.2024

Injection locking is a widely-used technique for generating clocks with low phase noise and high stability. Traditionally, these systems rely on long optical fibers, which makes them bulky and less practical for certain applications. In this blog post, we explore an innovative approach for driving and measuring highly stable GHz-range clocks based on a compact NOEMS platform with the microwave frequency lock-in amplifier, SHFLI.

Webinar Q&A – Unlock the Full Potential of Your Optomechanical Set-up with Digital Lock-in Amplifiers

23.10.2024

This blog post accompanies answer to the questions raised by the audience during the webinar "Unlock the Full Potential of Your Optomechanical Set-Up with Digital Lock-In Amplifiers".

Magnetic Field Measurement Using a SAW Delay Line Sensor and a GHz Lock-in Amplifier

13.06.2025

Magnetic field sensing is a captivating research domain with important implications for biological sensing. In this blog post, we delve into how a Surface Acoustic Wave (SAW) based device can be enhanced using a GHz frequency lock-in amplifier to push the limit of detection.

Webinar: Microwave Mastery with Mechanics

22.10.2025

This blog post accompanies our webinar Microwave Mastery with Mechanics. A big thanks to Dr. Rémy Braive, associate professor at Université de Paris Cité and CNRS-C2N who presented his recent experimental results.

Thank you also to everyone who joined the webinar and participated in the lively Q&A session. The answers to all the questions, along with a summary of the content, can be found below.

Nonlinear Systems: The Three Levels of Complexities

16.02.2026

From textbook‑linear to Duffing‑wild: we drive a piezo resonator into nonlinearity, watching a neat Lorentzian morph into hysteresis, fold bifurcations, and multistability—consistently across harmonics. Phase‑space snapshots via Poincaré sections reveal coexisting attractors, while a one‑pass PLL backbone nails amplitude‑dependent detuning and nonlinear stiffness. We tease what lies further out—chaos—and briefly hint at the knobs to reach it.